The novel oligomeric acid azo dyes prepared by coupling reaction of m-cresol-thiourea resin with diazonium salts of various substituted naphthol sulfonic acid with. The novel oligomeric acid azo dyes demonstrate outstanding dyeing possessions on a variety of textile fibers. They shows that the formed dye have dominant fixation properties. The dyes fixed on the fiber with nearly minor unemployed dye. The best part of the dyes have prominent fixation on textile at a less important quantity of exhaustion. While using these dyes commercially it may influence the environmental saving by a lesser amount of dye effluents from textiles.
