2-Naphthalenesulfonic acid, 6-amino-3-[[4'-[(4-amino-6-sulfo-1-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt

3,3′-Dimethoxylbenzidine double nitriding, first with 8-Aminonaphthalene-2-sulfonic acid coupling, and then in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? ?coupling.

blue and black. Soluble in water for violet black, soluble in ethanol purplish red color to red sauce. In the strong sulfuric acid as dark blue, for purple diluted. The dye solution with strong hydrochloric acid as dark blue, precipitation; Add thick sodium hydroxide solution for red sauce, precipitation.

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