Influence of ultraviolet radiation on colour of European ash sapwood and heartwood (Fraxinus excelsior L.)
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2016, Vol 93, Issue
Abstract
Influence of ultraviolet radiation on colour of European ash sapwood and heartwood (Fraxinus excelsior L.). This paper examines the influence of ultraviolet radiation on the colour of ash wood, used principally as flooring material or in veneer and furniture manufacturing. The colour parameters were determined using the CIE L*a*b* and CIE L*C*h colour space model. The research results show a small decrease in wood lightness, by 7% in sapwood, and by 5% in heartwood, after 300 h exposure to radiation. Material change towards yellow was, however, observed in the colour of in both sapwood and heartwood. After 300 h exposure, the b* parameter increased 2 and 1.5 times for ash sapwood and heartwood, respectively. The highest total colour difference in ash sapwood and heartwood was observed after 20 h exposure. The total colour difference as a result of ultraviolet radiation was nearly twice as high in sapwood as it was in heartwood.
Authors and Affiliations
Agnieszka Kurowska, Paweł Kozakiewicz
Keywords
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