Evaluation Of Aftertreatments For Reusing Reactive Dyes

The use of reactive dyes has increased rapidly due to outstanding properties, growing consumption of cellulosic fibers, and decrease in the production of other application classes of dyes for cellulosics because of cost and health hazards. However, reactive dyes cause the greatest effluent problems for the dye industry. This study explored reusing these dyes in which the residual dyeings were done using application procedures and aftertreatments suitable for direct dyes, rather than conventional methods for applying reactive dyes. Both exhaust and pad application procedures for reusing the reactive dyes were investigated. The residual or laboratory-hydrolyzed reactives were applied using procedures for direct dyes, then aftertreated with fixing agents. The depth of shade and colorfastness to washing and light of the dyes and aftertreated specimens were then