6473-15-0

5-Amino-2-hydroxybenzoic acid diazo, and Naphthalen-1-amine coupling, again diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acidcoupling, product to diazo, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

blue gray. Soluble in water for blue purple. In the dark for the strong sulfuric acid, after diluted blue-ray black precipitation. The dye solution to join strong hydrochloric acid blue precipitation; Add thick sodium hydroxide solution to blue.

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