disodium 5-[[4'-[[7-(acetylamino)-1-hydroxy-3-sulphonato-2-naphthyl]azo][1,1'-biphenyl]-4-yl]azo]salicylate

4-(4-Aminophenyl)benzenamine double nitriding, respectively with 2-Hydroxybenzoic acid and?6-Amino-4-hydroxynaphthalene-2-sulfonic acid?coupling.

dark red red to blue light. Soluble in water is cherry red. The strong sulfuric acid for dark red light purple, diluted for brown. The dye solution to join strong hydrochloric acid have brown light purple precipitation; Add thick sodium hydroxide solution for red light brown, a brick red precipitate

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	4-5	3-4	3-4	3		2-3