1'-Hydroxy-4-[[4-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]-7-sodiosulfo-1-naphthalenyl]azo]-6'-phenylamino[1,2'-azobisnaphthalene]-3',7-disulfonic acid disodium salt

8-Acetamido-5-aminonaphthalene-2-sulfonic acid diazo, and 5-Aminonaphthalene-2-sulfonic acid?coupling, again diazo, coupled with the 4-Hydroxynaphthalene-1-sulfonic acid, and then hydrolysis usions amino, again diazo, and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

blue. Soluble in water as dark blue, not soluble in alcohol. The strong sulfuric acid in dark green light for blue, blue for diluted. The dye solution to join strong hydrochloric acid color unchanged, but have precipitation; Add thick sodium hydroxide solution same color, have precipitation.

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