Effects of Dyeing Conditions on Discoloration Behavior for Oxidative Dyed Wool Fabrics

Abstract

The effect of air function on discoloration behavior of oxidation dyes in wool fibers at ordinary temperature and humidity in dark room was investigated. The samples dyed under three different dyeing conditions and dyed with the different mixed ratios of precursor and copular were used in experiment. In the color change defined by chromaticity diagram (a* and b*) and color tone diagram (L* and C*), the color tone of samples dyed under dyeing system including alkali and hydrogen peroxide changed more significant than that of samples dyed in the performed oxidation dye solution. The discoloration of samples dyed with the different mixed rations of precursor and copular is scarcely dependent on mixed ratio, except for the couple system of p-diaminotoluene/p-amino-o-cresol. The modifications of physical and chemical structure of wool fibers had no effect on the decreasing rate of K/S value for the samples dyed using three precursor / copular systems.