2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[[4'-[[4-hydroxy-2-(phenylamino)phenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-, disodium salt

3,3′-Dimethylbenzidine double nitriding, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?coupling, and then in alkaline conditions and 3-(Phenylamino)phenol coupling.

black. Soluble in water for violet black, slightly soluble in ethanol for red light purple. The strong sulfuric acid for blue, for purple diluted. The dye solution to join strong hydrochloric acid for purple, have precipitation; With strong sodium hydroxide solution for red sauce, precipitation.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
AATCC	4	4	2	2		2