In the case of the substantive direct dyestuffs, the function of salt is to increase the size of the colloidal aggregates of the dyestuff and thus to make easier their coagulation on the fabric [17].
In the case of the substantive direct dyestuffs, the function ofsalt is to increase the size of the colloidal aggregates of the dyestuffand thus to make easier their coagulation on the fabric [17].