Studies on the addition of reactive compounds to the dyebath of non-reactive dyes

Addition of the reactive compound 2,4-dichloro-6-(4-sulphoanilino)-s-triazine to dyebath solutions of several direct dyes under specified conditions generally leads to an increase in colour strength of dyed fabrics even after several washings. This increment depends, however, on the structure of dyestuff used. Direct Blue 2 (C.I. 22590) seems to be most suited for this procedure. Factors affecting the colour strength of the latter dye under different conditions were investigated.