Some Studies on Solvent Dyeing of Direct and Reactive Dyes on Cellophane

Abstract

Two direct and two reactive dyes were applied on Cellophane by a method of preswelling and then solvent dyeing from a 1:1 mixture of dimethylformamide and perchloroethylene. For producing reactive dyeings, a new technique of preswelling with sodium carbonate solution was evolved. Absorption spectra of the dyes in aqueous solution, solvents mixture, and on Cellophane were examined to study the changes in hue, if any. Values of the y/ x-band ratio were examined to study the physical state of the dyes in the various media, and characteristic fading curves were examined for comparative studies of lightfastness of the dyes applied on Cellophane by the conventional method from aqueous medium and by the methods of solvent dyeing tried herein.