Colour change of UV-irradiated and heat-treated wood species during 14 years of storage in total darkness

Varga, Dénes and Tolvaj, László and Joóbné Preklet, Edina (2025) Colour change of UV-irradiated and heat-treated wood species during 14 years of storage in total darkness. EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS, 83 (5). ISSN 0018-3768

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Abstract

Wood samples treated with ultraviolet (UV) radiation (200 h, 80 °C) and mild thermal treatment (200 h, 80 °C) were stored under laboratory conditions in complete darkness for 14 years. 15 wood species used by the carpentry industry were involved in the tests. Colour changes were monitored and presented using the CIE L*a*b* colour measurement system. Samples with low extractive content (e.g. spruce, poplar, maple and ash) presented the greatest increase in redness and yellowness during UV irradiation. Cherry, larch and American cherry showed the best stability against photodegradation. These tree species have the highest natural extractive content responsible for redness. Both UV irradiation and the subsequent natural ageing in dark conditions resulted in a greater increase in redness than in yellowness. Long-term storage in total darkness resulted in much greater redness and yellowness increases for UV irradiated samples than for slightly thermally treated samples. Thermal treatment at 80 °C followed by the long-term storage in darkness produced only small alterations in lightness, redness and yellowness.

Tudományterület / tudományág

engineering and technology > material sciences and technologies
natural sciences > physical sciences

Faculty

Not relevant

Institution

Soproni Egyetem

Item Type:	Article
SWORD Depositor:	Teszt Sword
Depositing User:	Csaba Horváth
Identification Number:	MTMT:36307060
Date Deposited:	12 Sep 2025 10:24
Last Modified:	12 Sep 2025 10:24
URI:	http://publicatio.uni-sopron.hu/id/eprint/3730

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