COLOR CHANGES OF VARIOUS WOOD SPECIES IN RESPONSE TO MOISTURE

• DOI: 10.22382/wfs-2019-014
• Publication Date: 2019-06-11T09:03:59Z
• Authors: J. Baar; Z. Paschová; P. Čermák; R. Wimmer
• Keywords: Lightness; Hue; Chromaticity; Gloss (optics)

Color including texture and gloss is one of the most important esthetical attributes wood. For any porous materials in contact with water, phenomenon surface darkening arises from a change refractive index, as water enters air-filled pores. first time, this research investigated to what extent MC differences affect color, below fiber saturation after pores are filled respect extractive contents. Samples 13 wood species were exposed various climates, soon EMC was reached, color determined. changes also recorded submersion vacuum impregnation water. Chromaticity parameters a* b* widely increased, along higher moisture Lightness changesweremostly stable at lower contents.An exceptionwas demonstrated by heartwood black locust, plum, walnut, oak, which showed brightening effect lowermoisture contents, followed phase. The overall high RH connected capillary condensation. Liquid present cell lumen caused an intensification hue (increase b*). Darkening even more expressed In conclusion, only limited fluctuations contents saturation, expected minor neglectabl