2-Hydroxy-5-[[4'-[[2,6-dihydroxy-3-[(3-sulfophenyl)azo]phenyl]azo]-1,1'-biphenyl-4-yl]azo]benzoic acid disodium salt

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, first coupled with 2-Hydroxybenzoic acid, and then in alkaline conditions and?3-Aminobenzenesulfonic acid diazo, in acid conditions Resorcinol coupled with the product matches.

Properties and Applications

brown. Soluble in water for yellow brown, slightly soluble in alcohol. The strong sulfuric acid to red light purple, for yellow brown after diluted. The dye solution to join strong hydrochloric acid for orange brown, have precipitation; Add thick sodium hydroxide solution for red light orange brown.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	2	3-4	3	1-2		2