ABSTRACT
Abstract: Reactive dyes react with cellulose to establish covalent bond and are water soluble. Dichlorotriazinyl reactive dyes are highly reactive, suitable for exhaust method; cellulose dyed with these develop poor wash fastness due to partial hydrolysis of dye, which is too hard to remove even with repeated washings while monochlorotriazinyl and vinyl sulphone dyes are less reactive, suitable for application by padding or printing and possess no partial hydrolytic property. Lack of overall affinity for cellulose in exhaust dyeing necessitates application of salt at higher concentration, which increases dissolved solid content of wastewater. Dyes are eco-friendly; full hue as well as shade range is available. When applied to silk, wool and nylon, reactive dyes are attached with chemical bond with good fastness with a consequence of unlevel shades.
