Phenomenon of Wood Colour

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Wood Science and Forest Products".

Deadline for manuscript submissions: 25 August 2024 | Viewed by 896

Special Issue Editors


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Department of Wood Sciences, Technical University in Zvolen, T. G. Masaryka 24, 96001 Zvolen, Slovak Republic
Interests: properties and structure of wood; processing of wood

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Guest Editor
Department of Wood Science and Thermal Techniques, Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Poznań, Poland
Interests: wood structure; wood composition; wood characterisation; wood conservation; wood preservation; waterlogged archaeological wood; structure–function relationships; wood decay; organosilicons in wood conservation; wood modification
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Guest Editor
Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague, Czech Republic
Interests: wood characterisation; wood structure and properties (mechanical testing, physical testing); wood modification; wood quality; wood-based materials (generally lignocellulosic materials, primarily wood-fiber boards-manufacturing process, development and properties); creep of wood and wood based materials; wood processing; recycling technologies; impact of silvicultural measures; wood (forest) sustainability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The perception of wood character includes its colour. The effects exerted on wood by surroundings through the surface, intensive heat transport through the surface or transforming energy for breaking chemical bonds of wood compounds significantly influence wood colour. Clarification of wood colour alteration mechanisms during such processes is desirable. The intelligent processing and use of wood requires the understanding of wood properties, including colour. The quality of wood is often linked to its colour. The final decision of customers is influenced by the colour of wood products. Wood products are modified with non-transparent coatings or transparent lacquers. The colour of wood is determined by observers using eyes or various devices. The correlation of colour with wood properties is an efficient tool in measurement methods. The colour design partially forms the wood texture. The assembling of pieces of wood into the final product, according to its texture, brings the challenges for designers or scholars to create smart, stable or added-value products.

We encourage experimental or theoretical studies to be incorporated into this systematic collection of information about wood colour, description of wood colour in phrased or digital form, measurement of wood colour, statistical approaches regarding wood colour, correlation of wood colour with properties of wood, wood colour during and after the interaction of wood with various forms of energy, the processes of forming new wood surfaces or their restoration, the colour of wood as a non-homogeneous, anisotropic and porous material, the reflectance and transmittance of wood, the wood colour under different illuminance, the colour of wood compounds, the colour of wood tissues, the wood defects colour, the colour of wood modified with different coatings, the wood texture as space distribution of colour on wood surfaces, and colours and texture of wood smart materials.

Dr. Richard Hrčka
Dr. Magdalena Broda
Dr. Vlastimil Borůvka
Guest Editors

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Keywords

  • wood
  • wood-based materials
  • colour
  • processes
  • surface
  • discolouration

Published Papers (1 paper)

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Research

11 pages, 2157 KiB  
Article
Homogenization of the Color of Beech Sapwood and False Heartwood by the Steaming Process
by Ladislav Dzurenda and Michal Dudiak
Forests 2024, 15(6), 1009; https://doi.org/10.3390/f15061009 - 9 Jun 2024
Viewed by 314
Abstract
This work presents the results of the homogenization of the color of sapwood and false heartwood Fagus sylvatica L. into a uniform color shade due to the influence of the temperature of saturated moist air and saturated water steam in individual steaming modes. [...] Read more.
This work presents the results of the homogenization of the color of sapwood and false heartwood Fagus sylvatica L. into a uniform color shade due to the influence of the temperature of saturated moist air and saturated water steam in individual steaming modes. The results of analyses of the influence of temperature within 24 h point out the different changes in the color of the sapwood and the wood of the false heartwood when the uniform color of the beech wood is achieved by the steaming process. By steaming beech wood with a false heartwood saturated with moist air at a temperature of tI = 95 °C during τ = 24 h, the color of the sapwood does not merge with the color of the wood of the false heartwood. The sapwood darkens and, on the other hand, the wood of the false heartwood slightly lightens, while the significant color contrast is removed, but the color homogenization in the individual zones does not occur. The unification of the colors in individual zones occurs during the steaming process at a temperature of saturated water steam tII ≈ 105 °C in 18 h, where the resulting brown color is identified in the color space CIE L*a*b* by the values of the lightness L* = 61.3 ± 2.2 and of the red color a* = 12.4 ± 1.3 and yellow color b* = 19.5 ± 1.4. The most pronounced homogenization of the color occurs through the steaming process at a temperature of saturated water steam tIII ≈ 120 °C, where the wood acquires a uniform dark brown–gray color in a time of τ ≈ 9 h steaming. The coordinates of the color-homogenized steamed beech wood are L* = 55.9 ± 1.9, a* = 12.3 ± 1.2, and b* = 19.6 ± 1.3. The unification of the colors by the steaming process is achieved by darkening both the sapwood and the wood of the false heartwood. In the overall color homogenization, the sapwood and the wood of the false heartwood do not participate equally in the steaming process. While the total color difference between the sapwood and a color homogenized state is quantified by the value ∆EtI* = 8, ∆EtIII* = 22.7, the total color difference in the wood with a false heartwood is only ∆EtI* = 1.9, ∆EtIII* = 11.8. Full article
(This article belongs to the Special Issue Phenomenon of Wood Colour)
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