3-[(5-Chloro-2-hydroxy-3-sulfophenyl)azo]-4-hydroxy-1-naphthalenesulfonic acid disodium salt

3-Amino-5-chloro-2-hydroxybenzenesulfonic acid diazotization, and 4-Hydroxynaphthalene-1-sulfonic acid coupling.

dark blue purple. Soluble in water for wine red, right amount soluble in ethanol to red. In concentrated sulfuric acid to purple, red orange after diluted. Dye aqueous solution to join concentrated hydrochloric acid for red orange; Add nano hydroxide to red.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	6	5	4	4	5	4-5