The effect of temperature, humidity and oxygen on fading of Crystal Violet (CV) in nylon 6 film were studied. In the presence of moisture, the fading of CV under dark proceeded more rapidly with temperature, resulting carbinol as one of the principal reaction products. The irradiation of visible light over 500 nm accelerated the fading of CV in the film, especially at elevated temperature and in the presence of humid air. Analysis using both the least square method and the principal component

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... alysis method revealed the formation of leuco compound (CVH), leuco base (CVOH) and Michler's Ketone (MK), accompanied with the formation of another products, such as their demethylated compounds. The effects of temperature, relative humidity and oxygen on the formation of these products were discussed.