N,N'-[1,1'-Biphenyl-4,4'-diylbis(azo)bis(5-hydroxy-7-sodiosulfonaphthalene-6,2-diyl)]bis(glycine sodium) salt

4-(4-Aminophenyl)benzenamine double nitriding, in alkaline conditions and ?6-Carboxymethylamino-1-naphthol-3-sulfonic acid?(2 Moore) coupled.

purple. Soluble in water for deep purple, soluble in ethanol. The strong sulfuric acid in blue, diluted red for sauce. The dye solution to join strong hydrochloric acid for red sauce, precipitation; With strong sodium hydroxide solution for purplish red color.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	3	4-5	3	2		2