5-Amino-3-[[4'-[[4-[(8-amino-1-hydroxy-3,6-disulfo-2-naphtyl)azo]-1-naphtyl]azo]-1,1'-biphenyl-4-yl]azo]-4-hydroxy-2,7-naphthalenedisulfonic acid tetrasodium salt

4-(4-Aminophenyl)benzenamine double nitriding, first with Naphthalen-1-amine coupling, product diazo again, and then in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid(2 Moore) coupled.

red light black. Soluble in water for a blue-black, slightly soluble in ethanol for blue-ray gray. The strong sulfuric acid in dark green light blue, diluted as dark blue and purple, have precipitation. The dye solution to join strong hydrochloric acid for blue-ray black to dark blue, precipitation; With strong sodium hydroxide solution for blue-ray black to blue.

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