Abstract
As the name implies, these dyes react with cellulose to establish covalent bond, 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 very difficult to remove even in 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 huge salt, which increases dissolved solid content of waster water. Dyes are eco-friendly; full hue as well as shade range exists. When applied to silk, wool and nylon, is attached with chemical bond with good fastness.
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