Abstract
Fading of vinylsulfonyl (VS) reactive dyes on cellulose by simultaneous effect of light and perspiration was studied by exposing dyed fabrics by ‘A’ method of JIS L 0888 and dyed films in aqueous solutions. A significant fading was observed with the dyed film in an aerated aqueous solution of sodium DL-mandelate and lactate. The fading process was accelerated in the anaerobic solution with a few exceptions. The fading of a dye on cellophane film in the anaerobic solution of substrate such as DL-mandelate was photoreduction of the excited dye by the substrate. On exposure in the solution containing both oxygen and substrate, the photosensitized oxidation of a dye via singlet oxygen mechanism and/or the photoreduction were found to occur depending on the experimental conditions such as concentrations of oxygen and substrate. The photofading mechanism of VS dyes on cotton fabrics immersed previously in an aqueous solution of artificial perspiration and exposed by the method of JIS L 0888 was similar to that on film exposed in the solution, although there were some differences between their fading behaviors.
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