1-Naphthalenesulfonic acid, 4-amino-6-[2-[4'-[2-(5-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]diazenyl]-5-hydroxy-, sodium salt (1:2)

3,3′-Dimethylbenzidine double nitriding, first in alkaline conditions and 8-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, and then in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling.

red light navy blue. Soluble in water for the navy, slightly soluble in ethanol for purple. The strong sulfuric acid for blue, purple for red after diluted. The dye solution to join strong hydrochloric acid for deep purple, have precipitation; Add thick sodium hydroxide solution for deep purple, have precipitation.

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