The light-fastness of simple mono-azo dyestuffs on polyamide fabric was studied. Examination of the characteristic fastness-grade curves give information about the relation between the size distribution of the dye particles on the fiber and its concentration. The fading rate of the dyestuffs as a function of the time of irradiation leads to evaluation of the fading-reaction order. The shape of the fading-rate curves and the characteristic fading curves are used to diagnose the physical state of the dyes in the fiber.
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