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Article

The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview

Laboratoire de Dynamique, Interaction et Réactivité – UMR7075, CNRS, Université Pierre-et- Marie-Curie (UPMC), c49, 4 Place Jussieu, 75252 Paris Cedex 05, France
Arts 2013, 2(3), 77-110; https://doi.org/10.3390/arts2030077
Submission received: 31 May 2013 / Revised: 3 July 2013 / Accepted: 5 July 2013 / Published: 15 July 2013

Abstract

:
The birth of Chemistry can be found in two main practices: (i) the Arts du feu (ceramic and glass, metallurgy, i.e., inorganic and solid state chemistry) and (ii) the preparation of remedies, alcohols and perfumes, dyes, i.e., organic and liquid state chemistry). After a brief survey of the history of (glazed) pottery and (enameled) glass artifacts, the development of destructive and non-destructive analytical techniques during the last few centuries is reviewed. Emphasis is put on mobile non-destructive Raman microspectroscopy of pigments and their glass/glaze host matrices for chronological/technological expertise. The techniques of white opacification, blue, yellow, green, red, and black coloring, are used as examples to point out the interest of pigments as chronological/technological markers.

1. Context

The foundation of Chemistry is often related to the practice of ancient alchemists. However, the know-how required for the transformation of matter, the definition of Chemistry, can be found in two main practices: (i) the Arts du feu, i.e., the preparation of pottery, glass, and metal artifacts (and related techniques for the selection and preparation of the raw materials used: geology, mining…), in other words Inorganic and Solid State Chemistry; (ii) the preparation of remedies, alcohols and perfumes, pigments, dyes, and binding for frescoes, painting, and textiles, in other words Organic and Liquid State Chemistry [1,2,3,4,5,6,7,8,9,10]. The artifacts were prepared by craftsmen and/or artists, the distinction between them depending on cultural criteria more than technological ones.
For a long time, the search for quality and uniqueness had led masters to develop original techniques in order to make a reproduction by contemporary professionals difficult. Consequently, secrets and master-to-disciple oral transmission were the common law. Greek and Roman literature [11,12,13,14,15] remains the reference for the ‘sciences’ and technologies used in the Western and Mediterranean areas during many centuries, the relative part, transmitted by Western, Byzantine, Syriac, and Nestorian Monks [16], or by Arab scholars [6,7,8,10], being strongly debated [16]. The technical literature remained scarce until the 17th century [6,7,8,9,10], the onset period of separation between practice and theory. That period also corresponds to the beginning of the large diffusion of book printing. At that time the separation between ‘Chemistry’, ‘Physics’, and Techniques is not yet consumed, and information on the ‘Arts’ of preparing materials and chemicals can be found in books dealing with Physique Experimentale [17,18], Elemens de Chymie Pratique [19], Histoire Naturelle [17,20], Physique [18], etc. or even Les Eléments de la Philosophie de l’Art du Feu ou Chemie (W. Davisson, the first Lecture in Chemistry given in France, published in Latin in 1655, in French in 1661, F. Piot, Paris), a typical title of the Alchemist’ tradition.
Rare documents were, however, published before the Quattrocento and Renaissance [21,22,23,24,25,26] and the publication of information about Arts and Sciences truly started in Western Countries afterwards ([27,28,29,30,31,32,33,34,35,36,37,38] and references therein). The authors were generally scholars, not professionals of the techniques, which limited the precision and reliability of the information. Furthermore, the translation/identification of some terms (raw materials and ingredients, procedures, etc.) is very difficult because of the use of metaphoric expressions. The artifacts thus remain the only reliable source to retrieve the information about the technology used and the artisan(s) know-how.
Just like industry companies conduct re-engineering studies in order to identify the innovation of their competitors by dismounting/studying their products, we will show how this approach may be used to retrieve the ancient “secrets” of artists and masters to prepare pottery and glass artifacts. This experimental approach dates back to the 18th century. The works of Macquer [19], Rouelle’ brothers, Fourcroy, Réaumur [37], and Lewis [38] can be considered as very illustrative. The contribution of Hellot has been pointed out by the study of his manuscripts [39]. Then, Brongniard [40,41], Salvetat [42], Bontemps [43], Deck [44], Bastenaire-Daudenart [45], Jacquemart [46], etc. also performed comprehensive studies.
The high cultural value and uniqueness of many artifacts imply either a minimization of the (micro)sampling, or the use of non-destructive techniques. Furthermore, displacement of the masterpieces out of their secure locations (Museum, Collectors, and reserve rooms), or their dismounting (building part), is rarely authorized. We will discuss the identification of chronological/technological markers, namely the identification of chromophores, pigments and associated materials, and their glassy silicate matrix, used in ancient masterpieces such as pottery, enamels and enameled glass, pastels, drawings, paintings, etc.

2. Pottery and Glass Technology: A Brief Survey

The production of pottery dates back to the Neolithic/Palaeolithic transition (>15,000 B.C. in Japan, Siberia and Africa) and requires heating above 600–650 °C to produce hard and robust artifacts by means of liquid phase sintering. The use and modeling of unfired clay pieces are much older, the first sculptures dating from the Palaeolithic (~30,000 B.P.) [47,48,49]. However, it has been claimed that the Dolní Věstonice Venus sculpture (25–29,000 B.P., Czech Republic) had probably been heated [48]. Glass paste and glazed artifacts date back to ~3000 B.C. (Mesopotamia) [50]. The crude beads usually formed around a wire have blue and green colors suggesting that they were used to evoke lapis lazuli and turquoise stones. True glass artifacts date back to ~1500–2000 B.C. (Egypt, Phoenicia, and Mesopotamia), colored/opacified with lead antimonate yellow, and calcium antimonate white [50]; heating at ~900–1000 °C was achieved [51,52,53,54]. Large glass production stopped for a few hundred years around 1200 B.C., a period of wars accompanied by a trade disruption [50]. Similar interruptions occurred with the decline of the Roman Empire. Centuries before, Chinese Shang and Shang-Zhou proto-porcelains (3000–1500 B.C.) were fired at temperatures from ~950 °C up to ~1200–1250 °C [55].
Roman potters (sigillata) and glassmakers experimented mass production [56]. Chinese Eastern Han to Sui potters (2nd B.C. –7th c.) initiated the development of very high temperature firing technology: Yue wares were fired above 1300 °C [55]. White porcelains appeared during Sui and Tang Dynasties (7th–8th c.). At the same period the Islamic potters found how opacification by cassiterite tin oxide combined with low temperature firing could compete with high temperature fired porcelain to produce artifacts with complex depictions [47,48,57,58]. This innovation resulted from the imitation of the three-color Chinese porcelain wares with lead-rich blue and green glaze dots deposited on a faience/terra cotta body covered with an alkaline glaze. The chemical reaction between the two glazes led to precipitation of white cassiterite [57]. This innovation was transmitted to Europe with the extension of the Islamic World (Ifriqaya (7th c.), al Andalous (8th c.), Sicilia (9th c.)) and then Italy (majolica, 13th c.) and France (15th–16th c.) [58,59,60,61]. Attempts to imitate the Blue-and-white Chinese porcelain were first made in Anatolia with Ottoman Iznik firewares from ~1450 to ~1620 [62,63,64] and then in Italy with Medici porcelain from ~1575 to 1587 [65,66], as well as in the whole of Europe one century after (18th century porcelain Manufactures) [67,68,69]. The availability of kaolin permitted the preparation of hard-paste alumina-rich porcelain, though the soft-paste porcelain route, which could be considered as an evolution of the Iznik fritware technology. A revolution took place after 1750 with the development of faience and porcelain factories (Figure 1). A second one occurred during the 20th century with the development of advanced ceramics, in particular dielectric passive components (capacitors, substrates, sockets, etc.) at the root of the development of microprocessors and computers [70].
Figure 1 illustrates the innovation law for the porcelain production [71]. It started in rare factories with a very specific technology. Then, attempts to produce similar artifacts were made in different places; with the circulation of persons and information, this number of places first expanded very rapidly and then decreased. Obviously, a differentiation between the first productions is easier, due to the diversity of raw materials and technologies. Indeed, competitors tried to imitate an artifact by using their specific raw materials and technology (Figure 2): therefore composition and/or microstructure (body) and/or nanostructure (glass, enamels, etc.) are different, though the objects look very similar. Then evolution towards the best compromise between cost and quality led to more similar objects.
Figure 1. Evolution of the number of porcelain manufactures in Europe during the 18th century, after P. Ricciardi et al. e-preservation, 2009, 22–26. [71].
Figure 1. Evolution of the number of porcelain manufactures in Europe during the 18th century, after P. Ricciardi et al. e-preservation, 2009, 22–26. [71].
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Figure 2. Evolution toward a common technology imposed by cost criteria and facilitated by the circulation of men and their know-how.
Figure 2. Evolution toward a common technology imposed by cost criteria and facilitated by the circulation of men and their know-how.
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There are two difficult tasks in ceramic and glass technologies, (i) the achievement of fine, reactive powders in order to facilitate their reaction, thus melting and the wettability between liquid and solid phases to keep the glaze thickness almost constant, and (ii) the firing and its control. The first pottery clays were iron oxide-rich because a liquid phase appears at ~700 °C between FeO and clays, promoting a good sintering in reducing atmospheres [72].
The use of microsized Mesopotamian silts allowed a perfect firing at low temperature [57]. The most difficult tasks were the glaze preparation, adhesion, and color control, which require empirical control at the nanoscale. However, a ceramic always shows a heterogeneous microstructure because the only goal to reach is the formation of a liquid phase at the grain interface in order to develop a soldering between grains. Only in porcelain, a large part of the body volume reaches the liquid state (~30–50%), which permits the final optical translucency [73,74]. On the other hand, the glass and glaze volume reach the liquid state leading to a ‘perfect’ homogeneity at the eye scale. Consequently, differences remain at a much smaller scale, the nano- and subnano-scales.

3. The Development of Solid State Chemistry and Related Technologies Offers Chronological/Technological Milestones

There are two methods to disperse chromophores in a glassy matrix: the first one is to dissolve 3d transition metals (Fe2+, Fe3+, Co3+, Mn5+, Cu2+, etc.) or 4f Rare Earth ions (Pr3+, etc.) with electronic levels absorbing in the visible range; the second one is the direct dispersion of pigment grains, a matter already containing ions of the kinds mentioned above, or more complex chromophores [75,76,77]. Note that the chemical and thermal stability of a pigment must be high enough not to be degraded/dissolved by the molten enamel. Each method has advantages and drawbacks. The first one is simple but hues are weak, the colors spread out easily because of the fast diffusion of small coloring ions, and reproducibility of the décor is difficult. The second technique requires sophisticated preparation (synthesis, grinding, flux addition). In both cases, the color palette is drastically reduced when the firing temperature increases.
Nature gives many examples of very vivid colors of another type, the iridescent colors that can be found for instance on blue Morphos butterflies, many beetles, opals, nacre, etc. The same kind of iridescence has been achieved by potters, centuries ago, in lustre pottery [78,79,80]. The color arises from scattering, i.e., positive and negative addition of the light waves (interferences) diffracted by more or less organized layers (gratings). Among modern items, the colored reflections of CD surfaces have the same physical origin.
The use of colored materials, natural or synthetic, is one of the most important foundations of Art. Some selected minerals, as well as chemical mixtures extracted from plants, wood, and animals, were used as the first raw materials [81,82].
First glazed artifacts were made of steatite, 4 millennia B.P. [83,84,85]. In Europe (Celts [79,83,86,87,88]) and Near-East (Egypt, Mesopotamia [84]) colored enamels and glasses were prepared using different chromophores, mainly metal nanoparticles, transition ions, as well as phases that form precipitates on cooling. However, since the forming elements (antimonates, stanates) [50] are major impurities of lead oxides, the main flux of glass and glaze, their precipitation was not really controlled. Consequently, improved technologies were lost repeatedly: for instance cobalt was used episodically by the Egyptians of the 18th Dynasty (~1500 B.C.) to color glass [89,90,91], and then stopped for centuries.
The mass production of pottery (Sigillata [56,92]) and glass artifacts [93] developed during Roman times. Some new technologies appeared at the end of the Roman Empire: gold tesserae in Ravenna and Byzantium [94], and the use of lapis lazuli as blue glass pigment [95], an unexpected discovery which questions the whole history of pigment technology (see further).
The Chinese chromophore technology was very specific with, for instance, the use of barium derivatives to produce violet, blue, and green colors [96,97,98] with a composition similar to that of Egyptian blue and green [99,100]. In actuality, great technological improvements took place during the 8th century in China (Tang porcelains [55,101,102,103]) and the 9th century in the Ancient World (Abbasids pottery [57,104,105]). The recent discovery of a Tang shipwreck cargo has changed our knowledge on the history of technological exchanges between China and the Mediterranean World [101].
Polychrome lustre pottery was produced for a few decades, only during the first Abbasids Dynasty [78,79,104]. A new technology, namely the yellow coloring of stained glass windows with silver metal nano-precipitates, appeared in the Middle-Ages [22,106]. Red stained glasses, a Celtic innovation [79,86,87,88], were prepared by alternation of very thin (tenths of micrometer) non-colored and copper metal-containing glass layers [107,108], in order to limit a too-strong light absorption. The controlled reduction of copper ions into metal nano-particles was used to make Jun, Flammés, and Sang-de-Pigeon Chinese porcelains. Cloisonnés enamels on metals, a technology that also emerged during Celtic times, continued during Byzantium, and flourished in Spain during the Middle-Ages [109]. Then, at Limoges (France), the enameling technique allowed the production of black-and-white and colored enamels on copper plates, depicting Greek, Roman, Christian, and then historical scenes [109,110]. The technology spread to China and then Japan [111], an example of West-to-East technology exchange. At the same time, Mamluks pushed the glass enameling to a very high level [112,113].
Painters of the Quattrocento and Renaissance used enamels and pigments developed by potters [114]. The first Technological Books became largely available [27,28,29,30,31] at that period.
The Ottoman Court, through the Nakashane Office, promoted the production of exquisite Fine Arts [64,65,104,115,116,117]. This involved a prodigious development of the ceramic pigment technology that spread out in many countries. The cross-over between the ancient praxis and beginning of the Science and Technology Epoch took place in the 18th century with the New Chemistry and the Encyclopaedists. Many books describing preparation procedures were published [34,35,36,37,38,39,40,41,42,43,44,45,46]. Many manufactures were founded and routes explaining the reactions leading to specific chemicals and products, e.g., the Macquer’ dictionary, became available [19]. With the turn between the 18th and 19th centuries, industrial workshops and the related innovations developed by mean of an increasing knowledge in solid and liquid state chemistry. Commercial colouring agents became more complex—different coloring agents/pigments were mixed together in a patented formula—which offered accurate chronological markers [40,41,42,43,44,45].
The onset of the development of organic chemistry took place around 1850, together with the race for the related innovating steps. People having experiences in both ceramic technology and science theory wrote books [118].
Cost and hazardous properties became very important criteria at the end of the 20th c. for environmental reasons, e.g., the limitation and then the replacement of lead in glass/enamel composition. This continuous evolution gives us a variety of markers to trace production place and time.

4. The Analytical Techniques of Artworks: Toward Non-Destructive Procedures

To date, the history of the scientific study of ancient artifacts is poorly documented. Alexandre Brongniart (1770–1847), with his Traité des Arts Céramiques ou des poteries considérées dans leur Histoire, leur Pratique et leur Théorie [41], can be considered as one of the founders of this kind of approach, at least for ceramic and glass technologies. He was a follower of the Encyclopaedists and of the rare precursors such as Ehrenfried Walther von Tschirnhaus (1651–1708) [116], René-Antoine Ferchaud de Réaumur (1683–1757) [37], Pierre-Joseph Macquer (1718–1784) [19], and Georges Leclerc Comte de Buffon (1707–1788) [20]. However, his books [40,41] were the first devoted to the potters and glassmakers rather than scholars. Productions from all over the world are described and a careful attention is paid to the identification of the raw materials used and to the firing techniques. For instance, A. Brongniard noted that in Corsica, female potters produced the first ceramic matrix reinforced composites, mixing asbestos long fibres with a calcareous clay [41,117].
In the third part of the 19th century, many technical books were rapidly published, especially in the famous Roret Encyclopédie series that covers most of the Fine Arts techniques [118]. Among books on ceramic technology and its history, ‘La Faïence’ from Théodore Deck (1823–1891) can be distinguished [44].
The first chemical analyses of the different parts of ancient pottery (body, glaze, lustre, etc.) was conducted by Duke of Luynes, A. Salvetat [41,42], and other famous chemists. Their studies were highly destructive.
A great improvement took place one century after (~1950), with the development of neutron activation techniques [119,120]. The development of X-Ray Fluorescence (XRF) instruments in the sixties, with the bore glass bead technique (boric acid or lithium tetraborate is added as a flux to solubilise about 1 g of ceramic in a Pt crucible and form a glass bead permitting quantitative composition measurement) [120,121,122,123] can be considered as the true onset of archeometry literature with the help of data processing (Principal Component Analysis, Cluster variation methods, etc.) [124,125,126,127]. The increasing sensitivity and versatility of instruments (Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS), Energy Dispersive Spectroscopy coupled with a Scanning Electron Microscope (EDS-SEM), etc.) significantly decreased the sampling size [90,91,128,129]. Microsampling is achieved with Laser Induced Breakdown Spectroscopy (LIBS) [130,131,132,133]. The development of accelerators with extracted particle beam gives opportunity, in rare laboratories, to study art pieces by Particle Induced X-ray Emission (PIXE), Rutherford Backscattering Spectroscopy (RBS), etc. [134,135,136,137]. Synchrotron sources offer new tools (XRF and diffraction-microbeam, Infrared microspectrometry) that have been extensively used for a few years [138,139,140]. However, though the brilliance of the source decreases the recording time, similar or even better results can be obtained—at a much lower cost - by using classical instruments.
Today the composition of most materials can be qualitatively determined in a micro-destructive/non-destructive way using portable XRF instruments [141,142,143,144,145]. In some cases (homogeneous materials, flat surfaces) the measurement can be quantitative: LIBS instruments [145,146] allow profiling the composition from the surface to the bulk, by means of a few microns-sized laser beam that drills the sample.

5. The Development of Mobile/Remote Raman Microspectroscopy

Irradiation of matter by a coherent electromagnetic wave induces coupling with the oscillating distribution of charges; in other words, with the chemical bonds in the system. Polarization of the excited dipoles generates a scattered electric field and associated waves [147,148,149]. A small part of the incident light is scattered with an energy different from the initial one due to energy exchange with the chemical bonds, and the prediction of this effect dates back to the beginning of the 20th century (L. Brillouin in France, A. Smekal in Russia [150,151]). First experimental evidences were given in the same month, in 1928, by different groups: two in France (Y. Roccard & M. Ponte and J. Cabannes [152,153]), one in Berlin (P. Pringsheim & B. Rosen [154]), one in Russia (G. Landsberg & L. Mandelstram [154]), and one in India (K.S. Krisnan and C.V. Raman [155]). Although the latter group was not the first to publish its work, it obtained the Nobel Prize in 1930 (Raman sent many preprints all over the world and received a high impact). The effect was called ‘Raman effect’. In actually, the technique relying on this phenomenon was developed in the 1970s with only the availability of Ar+ and Kr+ ion lasers. The development of Charge Coupled Devices and photodiode arrays in the 1980s, and then of CCD matrices in place of photomultipliers, increased the detection level by several orders of magnitude [147]. Replacement of the first monochromator stage (a diffraction grating) with Notch photonic crystals or Edge dielectric layered filters increased the detectivity significantly. Miniaturization and improvement of computers and electronic boxes allowed the size reduction of all the Raman set-up, and the conception of dedicated transportable/mobile spectrometers free of any moving parts (Figure 3). Today hand set-ups are available, but have reduced capabilities (poor resolution, low sensitivity).
Figure 3. Examples of on-site measurements with a mobile Raman set-up [144,156]; detail about the positioning of the remote optical head is given.
Figure 3. Examples of on-site measurements with a mobile Raman set-up [144,156]; detail about the positioning of the remote optical head is given.
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Our group is playing a pioneering role in the development of on-site Raman study of ancient (glazed) pottery [62,63,65,66], enameled glass [112,113], Limoges and Cloisonnés enamels on metal [109,110,111], paintings and drawings [157,158], patinated bronzes [144], rock art paintings [159], etc. (Figure 3). The poor resolution and complex background of spectra recorded with mobile Raman set-ups require the development of models expliciting the Raman signature and associated parameters in relation to the micro and nanostructure of matter, as well as the use of multivariate chemometric techniques [160,161,162,163,164] (Figure 4, Figure 5, Figure 6). The recent avaibility of small size laser sources with different colors is a new asset: typically, blue to green lasers are better for inorganic and light colored compounds, whereas red to infrared lasers show advantages for the study of organic and black compounds. However, red and yellow pigments are easily detected by using excitation of the red (typically 633 and 785 nm) [165]. Sophisticated optics, such as objectives optimized for the laser wavelength, with a large aperture to collect the scattered light with high efficiency, and a long working distance between the focus point and the front lens (to avoid any contact with precious items), are mandatory.
Figure 4. Parameters extracted by modeling the Raman signatures of the glazes of various artifacts assigned to Iznik and Kütahya Ottoman production were classified using the cluster classification technique to establish a procedure of indentification [65,66].
Figure 4. Parameters extracted by modeling the Raman signatures of the glazes of various artifacts assigned to Iznik and Kütahya Ottoman production were classified using the cluster classification technique to establish a procedure of indentification [65,66].
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An analytical study of the Raman signal can be used to identify the phases present in the volume of the analyzed system. Typically, many non-colored minerals and compounds can be identified by simple comparaison with reference spectra found in databases [75,165,166,167,168,169,170,171,172]. The narrower bandwidth of many signatures leads to a better detectivity of minor phases by Raman spectroscopy than by IR spectroscopy. However, the large variation of the Raman signal intensity with chemical bond polarizabilities (no spectrum for ionic bonding compounds, intense spectrum for covalent bonding compounds) renders quantitative analysis difficult.
Figure 5. (a) The limited scattering of the Qn stretching components of SiO4 tetrahedra indifferent Roman glass artifacts excavated in France, Italy, and Tunisia results from the controlled mass production using a single composition; on the other hand, the dispersed data measured for stained glass windows from Northern and Eastern France medieval churches arise from production by many different workshops [163]; (b) the absolute intensity of the Raman signal decreases with time because of the surface degradation of glass artifacts (leaching and microcracking); (c) the example given for Sainte-Chapelle (Paris) Rose window shows the easy differentiation by comparing as-recorded peak intensity between middle-aged and 19th century restored pieces [156]: #5, 1 and 2-type glass pieces are restored pieces; #4-type pieces are original weathered stained glass pieces ; (d) examples of Raman spectra as-recorded on enameled artifact with a mobile Raman set-up: the signature of pigments (two Naples yellow glaze) and colored glaze (cobalt blue glaze) is recorded with a rather good intensity, when the signature of non-colored glass consists of tiny broad peaks on the complex background due to the Edge filter.
Figure 5. (a) The limited scattering of the Qn stretching components of SiO4 tetrahedra indifferent Roman glass artifacts excavated in France, Italy, and Tunisia results from the controlled mass production using a single composition; on the other hand, the dispersed data measured for stained glass windows from Northern and Eastern France medieval churches arise from production by many different workshops [163]; (b) the absolute intensity of the Raman signal decreases with time because of the surface degradation of glass artifacts (leaching and microcracking); (c) the example given for Sainte-Chapelle (Paris) Rose window shows the easy differentiation by comparing as-recorded peak intensity between middle-aged and 19th century restored pieces [156]: #5, 1 and 2-type glass pieces are restored pieces; #4-type pieces are original weathered stained glass pieces ; (d) examples of Raman spectra as-recorded on enameled artifact with a mobile Raman set-up: the signature of pigments (two Naples yellow glaze) and colored glaze (cobalt blue glaze) is recorded with a rather good intensity, when the signature of non-colored glass consists of tiny broad peaks on the complex background due to the Edge filter.
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Recently available (portable) IR spectrometers give very useful information in the case of samples with flat, glossy surfaces [173,174].
The specific interaction between the laser light and the electronic levels of chromophores [117,173,174,175] gives rise to Raman resonance that leads to a high detectability, but requires a deep understanding of the phenomenon and, therefore, prevents from using databases. Instead, a Solid State Physico-Chemist approach is mandatory [176,177,178,179]. This approach, through the modeling of the Raman signal, allows for the analysis of the micro and nanostructure of matter, thus detecting many technological signatures in the objects: second phases, short range-order and structural distorsions, grain orientation and shape, etc. A discussion of the different models developed, especially for poor crystalline materials (Figure 6), is out of the range of this text but can be found in refs [160,161,162,163,164].
Figure 6. Diagram built with the highest wavenumber of bending and stretching bands in silicate glass signatures; each couple is characteristic of a given composition/nanostructure. Examples of typical compositions are given (stars). See references for details [108,109,111,112,113,160,161,162,163,164,179,180].
Figure 6. Diagram built with the highest wavenumber of bending and stretching bands in silicate glass signatures; each couple is characteristic of a given composition/nanostructure. Examples of typical compositions are given (stars). See references for details [108,109,111,112,113,160,161,162,163,164,179,180].
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6. Case Studies: White, Blue, Yellow, Green, Red, and Black Pigments and Coloring Agents

In order to illustrate the interest of chronological/technical markers we shall consider the different techniques used to achieve colors in glass and pottery.

6.1. White

The white color of a glass is obtained by dispersing a second phase within the glassy matrix; the dispersed phase must have a higher optical index than the matrix, to give a very efficient opacification. The particle/heterogeneity size must be smaller than the eye resolution, a few µm or less, typically. The opacification of a glaze masks the body coloration in order to depict a decor. Glaze, like any enameling, must have a thermal expansion slightly higher than the body to avoid cracking or scaling [174].
The simplest way to opacificy a glass (Table 1) is by dispersion of micronic bubbles (e.g., in Celadon [177,178] and first Meissen porcelains [179]). Other ways are the dispersion of micrometric grains of quartz [62], the precipitation of antimoniates [58,59,60,61,180], wollastonite [66,67], cassiterite [57,58,67,105], fluorite [111], calcium phosphates (bone opacification) [65,112,113], arsenates [109], as well as the addition of rutile, anatase and zircon in modern productions [76]. White slips and deposits, fired or not, are also used to obtain a white décor on terra cotta. Many of these phases are post quem markers. Many of the above compounds were also used in paintings, frescoes, illuminating manuscripts, etc. e.g., in refs [81,180,181,182,183,184,185].
Table 1. White pigments and opacifiers. Dates of innovation (first production) are given.
Table 1. White pigments and opacifiers. Dates of innovation (first production) are given.
ColorCompositionDate
Bone whiteCa2(PO4)2Antiquity
Chalk (calcite)CaCO3Antiquity
CerussitePbCO3Antiquity
Gypsum CaSO4 2H2OAntiquity
BassaniteCaSO4 1/2H2O?
AnhydriteCaSO4Antiquity
AntimoniateCaSb2O7, CaSb2O6Antiquity
KaolinAl2O3, 2SiO2, 2H2OAntiquity
Lead white ceruse Pb(OH)2500 BC
CassiteriteSnO29th
FluoriteCaF214th?
QuartzSiO216th.
Arsenates (Ca,Pb)1.5AsO417th
Zinc whiteZnO1781 (1834)
Lithopone ZnS - BaSO41874 (Western)
Titanium whiteTiO2 anatase
TiO2 rutile
1916 (1923)
19th?
Freeman’ whitePbSO419th
Hamburg whitePbCO3, BaSO419th
Barium whiteBaSO419th (Western)
ZirconiaZrO220th
ZirconZrSiO420th

6.2. Blue

Egyptian blue, a more or less crystalline copper-lime silicate (Table 2), can be considered the first synthetic pigment [99]. Besides, the earlier white (or yellow) antimoniate pigments may result from natural precipitation, once saturation is achieved during the cooling of the melt. Millennia later, Chinese Han potters developed a Baryum homolog to Egyptian blue [97,98] for the decoration of the famous terra cotta army of the Qui Shi Huang Xiang mausoleum.
The turquoise blue color was first obtained in Egypt by firing silicawares (synthetic or natural stone) in a copper-rich paste leading to a turquoise blue glazing of the object surface [41,84]. Episodically (18th Dynasty), cobalt was used instead [88,89]. These techniques use the dissolution of 3d Cu2+ or Co2+ ions in the glassy silicate.
Table 2. Name and composition of blue pigments and coloring agents. Dates of innovation (first production) are given.
Table 2. Name and composition of blue pigments and coloring agents. Dates of innovation (first production) are given.
ColorHueCompositionDate
Egyptian blueLight blueCaCuSi4O103000 BC
Turquoise Cu2+ in alkaline glass2000 BC
Han blue BaCuSi4O10200–500 BC
Han violet BaCuSi2O6200 BC
SmaltLight blueCoO nSiO2; Co-containing glassAntiquity
Lapis Lazuli (Lazurite)ultramarineNa8[Al6Si6O24]SnRoman
Cobalt,-manganese-iron ores dissolved9th
Indigo C16H10N2O2 indigotin<10th?
Prussian blue Fe4[Fe(CN)6]3 14–16H2O1704
Cobalt blueDark blueCoSiO2 olivine18th
Cobalt blueDark blue CoAl2O4 spinel1775 (1802)
Cerulean Dark blueCo2SnO4 spinel1810 (1821)
Cobalt chromite Co(Al,Cr)2O4 spinel
Synthetic ultramarine 1826
Cobalt spinel (Co,Zn)Al2O4 spinel
CoAl2O4/Co2SnO4 spinel
19th
Spinel aluminate blue BlueAl2O3; 0,5 ZnO; 0,5 CoO~1900
Turquoise blueAl2O3; 0,2–0,4 CoO; 0,6–0,8 ZnO
Dark blueAl2O3, 2 (PO4)2Co3 ou 2 (AsO4)3Co3
VioletAl2O3; 0,5 CoO; 0,5–1 MgO
Blue greyAl2O3; 0,6–0,8 CoO; 0,4–1,2 NiO
Dark blue greenAl2O3; CoO; Cr2O3
Light blue greenAl2O3; CrO4; CoO; ZnO
Zircon blueLight blueZrO2, SiO2 + V2O5 (<1%)~1950
Turquoise+ NaCl or NaF
Light blue+ Na2CO3
Cobalt oxideDark blueCo3O4
ZincochromiteDark blueZnCr2O4
Cobalt zinc oxideLight blueZnCo2O4
Posnjakite CuSO4 3Cu(OH)2 H2O
Cyprium Na3Ca(Al3Si3O12)
Vivianite Fe3 (PO4)2 8H2 O
Phtalocyanine blue C32H16CuN820th
Manganese blue BaMnO420th
The preparative chemistry of cobalt (chromium, etc.) is difficult: a small addition of cobalt (0.5–2 wt %) is sufficient to color a silicate glass, while higher cobalt-levels generally lead to precipitation of cobalt silicate (lead-rich glass) [67,75] or cobalt-aluminate (alumina-rich glaze) [186,187]. Consequently, before the 19th century, cobalt sources were natural ores containing very large amount of other transition metals such as manganese, iron, or chromium [90,91,177,188]. For instance Chinese/Vietnamese cobalt sources were manganese- and iron-rich ores, and the porcelain firing was performed under strongly reducing atmosphere so that the dark color of Mn4/5+ and Fe3+ ions would not obscure the blue hue [188 and references herein]. Since cobalt ores remain rare, recycling of blue glass was reported in remote antiquity.
The main alternative to obtain a nice blue color is the use of lapis lazuli, a stone associating lazurite or hauÿne feldspars (colored by some S2- ions located in site of the feldspar structure) with pyrite and diposide. Sources of lapis lazuli, are scarce: mainly in Afghanistan, and for a minor part in Baikal Lake mines and in Chile [189,190,191,192]. Moreover, the access to Afghanistan mountains mines was difficult, and stopped in different periods of history, especially during Sassanid Dynasties. Consequently, many scholars in Western Countries considered lapis lazuli as a very rare material and therefore rejected its use in glass and ceramic. Raman studies have shown that this view was erroneous. The first evidence for the use of lapis lazuli as a glaze pigment was given by Clark et al. on pottery excavated in a 14th c. Swabian-Normand-Islamic context [193,194,195]. If cobalt was easily detected by analytical techniques such as ICP or XRF [91,92,192,196,197], the detection of lapis lazuli small grains, dispersed in a silicate matrix by the same methodology, was not possible: first, because the composition of the feldspar host framework is close to that of the glass, and second, because the S traces are masked by SO4 traces, common in ancient glasses. On the contrary, the Raman resonance of the S2- chromophore under green laser excitation allowed detecting the presence of S-doped feldspar very easily [95,113,157,180,193]. Thus, it was demonstrated that both cobalt and lapis lazuli could be used simultaneously in the glaze of a rather common Lâjvardina artifact, contradicting the alleged high cost of these pigments at the period considered (14th c.) [190]. It is now obvious that during the 14th–15th centuries, lapis lazuli was a common blue pigment. A recent study also points out that a Roman enameled glass, the Lübsow beaker, already contained lapis lazuli as blue pigment [95]. Mamluk enameled glass objects as well as the blue enamel of the famous Begram Treasure [198] were also made using this blue pigment [113]. In addition, the discovery of glass shards in Frederick II Melfi’s castle, dated from the second half of the 13th-first half of 14th century, gives arguments in support to a direct link between Roman-Byzantine glassmakers/potters and Islamic ones through the Swabian-Normand Court [193,194,195].
An unexpected use of Lapis lazuli was observed in the first hard-paste Meissen porcelains made by J.F. Böttger [179]: the selected kaolin has iron oxide traces and the fired body remains gray, not white. The opacification of the glaze was only achieved by dispersion of micronic bubbles, a technique not sufficient to completely cover the gray color of the body. To achieve a white color, Böttger, educated as lapidarian expert, added lapis lazuli blue grains at the body-glaze interface: the artifact looked as white as the Chinese model, made with Kaolin of higher quality. Different modern ceramic pigments are now available to obtain blue color [76,77,165,187,199].

6.3. Yellow

Stable yellow colors are difficult to prepare. The easiest way to obtain a yellow glaze is to saturate a silicate with lead, inducing precipitation of massicot PbO [58]. With the development of majolica wares, Naples yellow, a large pyrochlore solid solution between PbO-SnO2-Sb2O3/Sb2O5 with addition of SiO2, Fe2O3, and ZnO became the most widely used pigment [59,60,61]. Because of the very large range of the solid solution, the composition actually achieved is specific to a factory and, therefore, a good production marker [112,200].
Table 3. Name and composition of yellow pigments and coloring agents. Dates of innovation (first production) are given.
Table 3. Name and composition of yellow pigments and coloring agents. Dates of innovation (first production) are given.
ColorCompositionDate
OchreFeO(OH) goethiteNeolithic
Massicot PbOAntiquity
Orpiment & pararealgarAs2S3 - As4S4Antiquity?
SaffronC20H24O4 crocetinAntiquity
OcreFe2O3 H2O + clays + SiO2Neolithic
Naples yellow
Lead-antimony yellow
Pb2Sb2O7 pyrochlore1500 BC
Palmatine[C21H18NO4]+ XAntiquity
Naples yellow
Lead-tin yellow type I
Pb2SnO4Antiquity
Berberine[C20H18NO4]+Antiquity
Silver yellowAg nanoparticules in glass matrix12th
Or mussifSnS213th.
Indian yellowMgC19H16O11 5H2O15th.
Naples yellow
Lead-tin yellow type II
PbSn xSixO315th?
Strontium yellow SrCrO41800
Barium yellow BaCrO419th.
Cadmium yellowCdS (+CdSe)1829 (1845)
Chrome yellow/orangePbCrO4 (+PbO)1809 (1820)
Aureolin
Cambodia yellow
K3[CO(NO2)6] nH2O
C38H44O8 et C29H36O6
1861
Rutile yellow(Ti,Ni,Nb)O2 rutile20th
Cassiterite yellow(Sn,V)O2 cassiterite20th
Primrose yellow2Ni,3BaO,17TiO2 priderite20th
Zinc yellowZnCrO41809 (1850)
CurcumaC21H20O6
Uranium yellowPbUO419th
StibineSb2O5
Malayite yellowCaSnSiO5 sphene malayite20th
Praseodymium yellow 20th
New pigments were searched for during the 19th and 20th centuries (Table 3) to obtain a variety of yellow hues, such as uranium yellow, zinc-chrome yellow, rutile yellow, Praseodymium yellow, etc. [76,77,165,199].
A specific mention must be made of silver yellow: yellow glasses are prepared by diffusion of Ag+ silver ion from the glass surface inward and then in situ reduction into metal nanoparticles to obtain coloration by the Ag° plasmon light absorption. This technique was first described in middle-age reports [22,79,106]. Because the plasmon absorption is very strong, the layer colored by silver metal particles must be very thin to keep its transparency (see further the discussion for red copper glass).
Note that the huge plasmon absorption peak makes the observation of low wavenumber nanoparticle modes difficult under excitation with absorbed laser wavelength [79]. In this case, the Raman spectrum only reflects the nanostructure around the metal nanoparticle and does not correspond to the glass matrix [57,79,106,108,201].

6.4. Green

Green glasses and glazes have been obtained since the Egyptian times: Egyptian potters and glassmakers prepared a greenish derivative of Egyptian blue (different composition, different crystallinity) by diffusion of copper ions into a silica-rich body—or stone—from a Cu-rich paste in which the artifact was wrapped [41,84,85,165,199].
Roman craftsmen prepared copper-containing lead-based glass. This technique remained the only one for a while, inducing in China [101,102,103], before the use of chromium-rich ores by Iznik Ottoman potters developed [62,63]. However, other minerals were used as pigments for paintings and illuminating manuscripts (Table 4): malachite, green earths, vert-de-gris, etc. [81,165,183,184,185,199].
Table 4. Name and composition of green pigments and coloring agents. Dates of innovation (first production) are given.
Table 4. Name and composition of green pigments and coloring agents. Dates of innovation (first production) are given.
ColorCompositionDate
MalachiteCuCO3 Cu(OH)2Antiquity
Atacamite CuCl2 3Cu(OH)2Antiquity
Green earthK[(Al3+, Fe3+)(Fe2+, Mg2+)],(AlSi3,Si4)O10(OH)2Antiquity
Vert-de-gris Cu(CH3COO)2Middle age
[Cu(CH3COO)2]2 Cu(OH)2 5H2O
Cu(CH3COO)2 Cu(OH)2
GreenCr in glassOttoman
Scheele greenCu(AsO2)21778
Cobalt greenCoO nZnO1780, >1830
Dark greenCr2O3 haematite1800
Emerald greenCu[C2H3O2] 3Cu[AsO2]21814
ViridianCr2O3 2H2O1838 (1859)
Victoria green3CaO, Cr2O3, 3SiO219th
Yellow green: + CaCl2 & CaF2
Dark green: + CaF2
Middle green: + LiF
Chromium
Green
Light green: ZrO2, SiO2, Na2WO4, K2Cr2O7, NaCl
Olive: ZrO2, SiO2, Na2WO4, NaCl
Nickel greenNi2SiO4 olivine
Chromite greenCoCr2O4 spinel
Cobalt greenCo2TiO4 spinel
Yellow + blueYellow pigments in blue matrix18th
Green color is also achieved by dispersing yellow pigments in a blue matrix [75]. Chromium-based pigments were developed during the 18th century and still compete with organic chromophores for many applications.

6.5. Red

The technique to obtain red glass using a dispersion of copper nanoparticles can be considered, with the pottery technology itself, as the first example of nanotechnology [79,80,106]. Indeed, the possibility to prepare, at relatively low temperature, a variety of ceramic is directly related to the nanosized character of clay particles, which allows their dispersion in water as colloid or gel. The control of the rheology, plasticity, and high reactivity of the latter phases then permits the low firing temperature [202]. The controlled dispersion of a small quantity of copper (red), silver (yellow to brown) and gold (red) metal nanoparticles in an optically clear glass gives rise to colorful materials through the specific interaction of light with the electron gas at the particle surface, the so-called plasmon resonance (Figure 7). This leads to narrow peak absorption and more complex features related to the particle composition, size, and shape [57,79,106,201].
Table 5. Name and composition of red pigments and coloring agents. Dates of innovation (first production) are given.
Table 5. Name and composition of red pigments and coloring agents. Dates of innovation (first production) are given.
ColorCompositionDate
Copper redCo metal nanoparticles in glass matrixNeolithic
VermillionHgSNeolithic
Ochre & Earths Fe2O3 + clay + SiO2Neolithic
Haematiteα-Fe2O3Neolithic
Purpurin C14H18O53000 BC
Tyr purpleC16H10Br2N2O21400 BC
LithargePbOAntiquity
Minium Pb3O4Antiquity
KermesC16H10O8Antiquity
Realgar As4S4Antiquity
Haematite/hercyniteFe2O3+ SiO2Antiquity
Umbria earthFe2O3, MnO2 + clay + SiO2
Cassius’ purple
Kinkel’ red
Au metal nanoparticles in glass matrixRoman?
MadderC14H8O4Middle-age
CarmineC14H8O4 (alizarin) + purpurin16th.
Armenian BoleFe2O3 + clay + SiO214th
Thiviers sandstoneFe2O3+ SiO217th
Mars redFe2O3 synthetic, nanosized<18th.
MendipitePb3O2Cl2
Cadmium redCdS (+ CdSe)1907
Copper dispersion in glass was controlled by Celts, millennia ago [79,86,87,88], and red Roman mosaic tesserae were prepared with the same technique [180,203]. Silver dispersion was largely used to prepare yellow middle-age stained glass windows [26,106,118], and gold ruby glasses made by Renaissance glass-makers are famous [108,116,118,196,197,204,205]. Rare artifacts such as the Licurgus cup (4th century) [79,206,207] or some Roman tesserae contain both copper/silver and gold [203], indicating that ruby gold glasses date back at least to the end of the Roman Empire.
Figure 7. (a) UV-visible absorbance curve of a 19th century typical glass, free from or with a 200 µm thick Cu°-containing layer exhibiting a plasmon peak; (b) optical micrograph of a Middle-Age red flashed glass showing alternate colored and non-colored glass. This example shows the sophistication of the ancient technology (after [108]).
Figure 7. (a) UV-visible absorbance curve of a 19th century typical glass, free from or with a 200 µm thick Cu°-containing layer exhibiting a plasmon peak; (b) optical micrograph of a Middle-Age red flashed glass showing alternate colored and non-colored glass. This example shows the sophistication of the ancient technology (after [108]).
Arts 02 00077 g007
Another way to obtain a nice red or orange color is the use of nanosized haematite or parent structures. The size reduction of particles, by broadening the electronic absorption bands, decreases the electronic gap, leading to a small change of color. This phenomenon is at the origin of the nice color of Roman Sigillatta [56], where the orange to red color of the fired slip arises from the association of micronic haematite and corundum grains. Rather similar fine microstructures are observed for Iznik red (Armenian bole) [64,65], red Meissen décor, and French faience red décor obtained using Thiviers sandstone as red pigment precursor [208]. Note that fake red dots made with organic pigments can be observed on ancient Islamic masterpieces, “embellished” in order to improve their commercial value [112].

6.6. Black

Although the black color is easily obtained from carbon by controlled firing of organic precursors (plants, bones, ivory, etc.) [157,158,165,199], the preparation of a black glaze/enamel in association with other colors is very difficult, especially in oxidizing firing atmospheres [209] and dates from the Ottoman period in Western Countries (Table 6). Song potters produced outstanding black glazed artifacts that continue to attract the interest of modern potters [210]. On the other hand, black terra cotta décors had been obtained since the beginning of pottery, and achieved a very high level in the Greek period by controlled reduction of iron-rich clays and slips [211,212].
Note the early use of Bismuth [205]. New ceramic pigments were developed during the 19th century.
Table 6. Name and composition of black pigments and colouring agents. Dates of innovation (first production) are given.
Table 6. Name and composition of black pigments and colouring agents. Dates of innovation (first production) are given.
ColorCompositionDate
Carbon blackCNeolithic
EarthsMnO2, clays, Fe(OH)3Neolithic
Bismuth blackBi>15th
Spinel blackCr2MnO4 spinel15th
Tin-massicotPb2SnO4
Copper blackCuO
Cobalt blackCoO

7. Lustre, Another Way to Master the Color

Rare ancient reports suggest that iridescent glass has been prepared in (late) Roman times [118], but to date no actual artifacts has been described and a fortiori studied. Some scholars say that the first lustres were made on glass artifacts a few decades before Abbasids lustre pottery (Mesopotamia, 9th century) [104]. However, examination of the objects—in their more or less preserved state—points out that their lustre level is very limited. Further studies are necessary to clarify the lustre origin.
Lustre coloration is obtained by combination of plasmon absorption and interferences [78,79]. An interference-built color requires a very specific orientation of the observer’s eyes vs. the artifact and the source of light (Figure 8), as well as a very specific micro/nanostructure of the material, made of a transparent matrix with an ‘organized’ dispersion of silver, copper, or gold nanoparticles.
Figure 8. (a) The Transmission Electronic Microscopy micrograph of a modern lustre replica prepared by combined oxidizing- CO reducing sequences shows the metal nanoparticle-rich layers in the silicate matrix (Courtesy of Ph. Sciau, CEMES, Toulouse); (b) the copper nanoparticle-containing lustre glaze exhibits the well-defined Plasmon peak in the yellow-green range, the color of the plasmon peak depending on the nanoparticles shape and size. For most of the observation angles, this Fatimid’s lustre (Fustât excavation, Egypt) looks reddish but for a specific orientation vs. the enamel surface, the viewer and the light source, the diffraction takes place, giving a golden shining. Metal nanoparticle-containing glasses, called dichroic glasses, have different color in reflexion and transmission.
Figure 8. (a) The Transmission Electronic Microscopy micrograph of a modern lustre replica prepared by combined oxidizing- CO reducing sequences shows the metal nanoparticle-rich layers in the silicate matrix (Courtesy of Ph. Sciau, CEMES, Toulouse); (b) the copper nanoparticle-containing lustre glaze exhibits the well-defined Plasmon peak in the yellow-green range, the color of the plasmon peak depending on the nanoparticles shape and size. For most of the observation angles, this Fatimid’s lustre (Fustât excavation, Egypt) looks reddish but for a specific orientation vs. the enamel surface, the viewer and the light source, the diffraction takes place, giving a golden shining. Metal nanoparticle-containing glasses, called dichroic glasses, have different color in reflexion and transmission.
Arts 02 00077 g008
Figure 8a shows the near surface section of the Fatimid lustre shard. Metal particles appear in dark. So the upper region appears free from metal particles and the alternation of layers with and without metal particles is obvious. The precise chemical analysis of the dark particles shows that they consist of small silver and copper, rarely alloyed, single crystals [79,80]. Copper can exist both as Cu° metal particles and as dissolved Cu+ or Cu2+ ions. The upper oxidized particle-free layer plays an important role for the optical properties. Namely, this impedance adaptation layer promotes penetration of light down to the metal-containing layers, maximizing the scattering and hence the single color lustre shining in combination with the number of layers, with and without metal nanoparticles. Large disorder in the particle shape and size distribution destroys the interference contribution, letting the color be determined by the plasmon absorption: red for copper, golden brown for silver. Abbasid and Fatimid Lustres show well-defined interferences and lustre shining [78,79,80].
Rare polychrome Lustre pottery shards have been excavated from Susa and Samara. The best example is the tile series forming the décor of Kairuan mosque (Tunisia, [78]): for a given observation angle, blue and green lustres are observed on a tile simultaneously. Such high-quality polychrome lustres seem to have been produced only during a few decades. Majolica and Mudejar lustres do not exhibit various colors [78,79,80], and are very similar to more modern lustres like Meissen, Burgos, or Lüdersdorff productions, or even bismuth-based metallization [118].

8. Conclusion: Master’s Secrets as Chronological/Technological Milestones

The use of mobile, non-destructive Raman spectroscopy, notwithstanding the important instrumental limits vs. fixed instruments excited with a variety of laser wavelength, has allowed the achievement of important results. It outlines the technologies, with the essential advantage of preserving the objects in their museum rooms. The development of new mobile Raman instruments able to perform mapping (as under development for Mars explorations) and/or excited with blue or UV laser should improve the efficiency of the mobile Raman technique for the study of these and other artifacts.
Raman analysis of several examples of enameled glass objects and glazed pottery/porcelain yielded important information both on the coloring agents/pigments used and on the technological procedures employed. As an illustration, Table 7 lists remarkable case studies, pointing out specific use of Lapis lazuli and/or unexpected white opacifiers identified by Raman scattering. Identification of these unexpected pigments offers criteria to follow the transmission of a technology as well as to differentiate genuine, embellished/restored, or fake artifacts.
Table 7. Technologies used to obtain blue and white hues as evidenced by Raman microscopy.
Table 7. Technologies used to obtain blue and white hues as evidenced by Raman microscopy.
Artifact PeriodTechnologyRef.
Begram glass Treasure1st century AD
Roman Empire
Lapis lazuli[198]
Ptolemaic faience pottery 1st century AD
Roman Empire
Lapis lazuli[213]
Lübsov glass beaker2nd century AD
Roman Empire
Lapis lazuli as blue & calcium antimonate as white pigments[95]
Abbasid pottery9th c.Cassiterite opacifier; Lustre[57]
Lâjvadina pottery, Iran13th c.Lapis lazuli and cobalt as blue glaze pigments[189,190]
Enameled glass and Pottery, Frederic II Souabian Court, Apuglia13th–14th c.Lapis lazuli as blue & calcium phosphate as white pigments[195]
Mamluk mosque lamps13th–14th c.Lapis lazuli as blue & calcium phosphate as white glaze pigments[113,198]
Medici porcelain
Florence
1575–1587Calcium phosphate[65]
Feldspar & wollastonite
Böttger porcelain
Meissen
1700–1708Lapis lazuli grains at the body-glaze interface. Bubble as opacifier.[179]

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MDPI and ACS Style

Colomban, P. The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview. Arts 2013, 2, 77-110. https://doi.org/10.3390/arts2030077

AMA Style

Colomban P. The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview. Arts. 2013; 2(3):77-110. https://doi.org/10.3390/arts2030077

Chicago/Turabian Style

Colomban, Philippe. 2013. "The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview" Arts 2, no. 3: 77-110. https://doi.org/10.3390/arts2030077

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