Direct Dyes are a class of hot water dyes for use on cellulose fibers, such as cotton. It is one of the two types of dyes that are mixed in all-purpose dyes’ such as Rit, Tintex Hot Water dye, and Dylon Multi-purpose Dye. Direct dyes or substantive dyeing is normally carried out in a neutral or slightly alkaline dyebath, at or near boiling point, with the addition of either sodium chloride (NaCl) or sodium sulfate (Na2SO4).
