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Open AccessArticle

The “oro di metà” Gilding in the Fifteenth-Century: A Multi-Analytical Investigation

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Institute of Applied Physics “Nello Carrara” (IFAC)-National Research Council (CNR), 50019 Sesto Fiorentino (FI), Italy
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Institute of Chemistry of Organometallic Compounds (ICCOM)-National Research Council (CNR), 50019 Sesto Fiorentino (FI), Italy
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Institute for the Conservation and Valorization of Cultural Heritage (ICVBC)-National Research Council (CNR), 50019 Sesto Fiorentino (FI), Italy
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Gallo Restauro, 50129 Florence, Italy
*
Author to whom correspondence should be addressed.
Heritage 2019, 2(2), 1166-1175; https://doi.org/10.3390/heritage2020076
Received: 12 March 2019 / Revised: 10 April 2019 / Accepted: 15 April 2019 / Published: 18 April 2019
(This article belongs to the Special Issue Advances of Analytical Chemistry in Cultural Heritage)
Few and fragmentary is the information regarding the “oro di metà” (halfway gold) gilding due to the low probability of finding it in paintings as well as its short durability because of tarnishing. However, the very rare, excellent state of conservation of the gilding found in the fifteenth-century wood panel painting of the Master of St. Ivo studied in this work along with a multi-analytical approach allowed shedding light on the structure, the composition and the conservation state of this type of gilding. An Ultra-High Resolution Scanning Electron Microscope (UHR-SEM) along with Energy Dispersive X-Ray (EDX) analysis and polarised light Optical Microscopy (OM) were employed in order to image and analyse a cross-section of a sample taken from the wood panel painting. Results highlighted a divided structure of the gilding which is constituted by two separated layers of gold and silver with different thickness. This is the first time that scientific evidence on this issue is provided. Moreover, considerations on the tarnishing process of the gilding were made. Finally, complementary vibrational spectroscopic techniques such as micro-Raman and micro-ATR-FTIR were employed in order to identify the molecular composition of the “bole” (gilding preparation layer) and the ground layers. View Full-Text
Keywords: oro mezzo; bole; gold alloy; water gilding; tarnishing; polarised optical microscopy (OM); Scanning Electron Microscopy (SEM); Energy Dispersive X-Ray (EDX) spectroscopy; micro-Raman spectroscopy; micro-ATR-FTIR spectroscopy oro mezzo; bole; gold alloy; water gilding; tarnishing; polarised optical microscopy (OM); Scanning Electron Microscopy (SEM); Energy Dispersive X-Ray (EDX) spectroscopy; micro-Raman spectroscopy; micro-ATR-FTIR spectroscopy
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MDPI and ACS Style

Osticioli, I.; Capozzoli, L.; Salvadori, B.; Banchelli, M.; Lavacchi, A.; Matteini, P.; Siano, S.; Gallo, L. The “oro di metà” Gilding in the Fifteenth-Century: A Multi-Analytical Investigation. Heritage 2019, 2, 1166-1175. https://doi.org/10.3390/heritage2020076

AMA Style

Osticioli I, Capozzoli L, Salvadori B, Banchelli M, Lavacchi A, Matteini P, Siano S, Gallo L. The “oro di metà” Gilding in the Fifteenth-Century: A Multi-Analytical Investigation. Heritage. 2019; 2(2):1166-1175. https://doi.org/10.3390/heritage2020076

Chicago/Turabian Style

Osticioli, Iacopo; Capozzoli, Laura; Salvadori, Barbara; Banchelli, Martina; Lavacchi, Alessandro; Matteini, Paolo; Siano, Salvatore; Gallo, Loredana. 2019. "The “oro di metà” Gilding in the Fifteenth-Century: A Multi-Analytical Investigation" Heritage 2, no. 2: 1166-1175. https://doi.org/10.3390/heritage2020076

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