1,6-Naphthalenedisulfonic acid, 8-hydroxy-7-[[4-[[4'-[(1-hydroxy-3,8-disulfo-2-naphthalenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-1-naphthalenyl]azo]-, tetrasodium salt

3,3′-Dimethylbenzidine double nitriding, first with Naphthalen-1-amine coupling, its product to diazo, and 8-Hydroxynaphthalene-1,6-disulfonic acid (2 Moore) coupled.

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

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	3-4	4	3	2		2-3
AATCC	5	4	2	3-4		1-2