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Violet light causes photodegradation of wood beyond the zone affected by ultraviolet radiation
The limited penetration of wood by light explains why the weathering of wood exposed outdoors is a surface phenomenon. Wood is rapidly degraded by short-wavelength UV radiation, but the penetration of light into wood is positively correlated with its wavelength. Hence, subsurface degradation is likely to be caused by longerwavelength light that still has sufficient energy to degrade wood. In this paper we test this hypothesis and determine the wavelengths of visible light that extenddoi:10.1515/hf.2007.005 fatcat:hagugog77vc4lhuvnnzmjsoh6i