The color fading behavior of natural anthraquinone dyes due to environmental condition has been investigated. The results show that the chemical nature of the substrate fibers determines the direction of the light fading reaction involved. The extent of the color fading of those dyes under light irradiation is clearly related to the oxidation index of each dye for cellulosic fibers, whereas a different mechanism operates for proteinaceous fibers.
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Saitō et al. (1988) studied this question.
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