5-Amino-3-[[4'-[(8-amino-1-hydroxy-5-sodiosulfo-2-naphthalenyl)azo]-1,1'-biphenyl-4-yl]azo]-4-hydroxynaphthalene-2,7-disulfonic acid disodium salt

4-(4-Aminophenyl)benzenamine double nitriding, in alkaline conditions in turn and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acidcoupling.

dark blue. Soluble in water for blue, slightly soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for colourful blue, diluted for purple; In nitric acid solution for blue, to brown. The dye solution to join hydrochloric acid blue precipitation; Add 10% sodium hydroxide solution for Violet.

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