ENVIRONMENTAL-EFFECTS OF OXYGEN ON THE FADING OF MONOCHLOROTRIAZINYL REACTIVE DYES ON COTTON FABRICS

The environmental effects on the fading behavior of monochlorotriaziny l reactive dyes on dry cotton fabrics when exposed to an atmosphere of nitrogen, oxygen, and air were studied, Most dyes showed a two step f ading behavior, i.e. an initial and then smaller subsequent fading. Ma ny of the dyes examined underwent the largest fading in oxygen, but a phthalocyanine dye showed it in a nitrogen environment. With an increa se in the concentration of oxygen, the initial fading of almost all of the dyes increased, On exposure in air, some dyes showed an initial o xidative fading followed by a reductive fading, while the fading for a phthalocyanine dye and for CI Reactive Blue 2 decreased in nitrogen, i.e. a suppressive effect of oxygen on reductive fading. (C) 1998 Else vier Science Ltd.