7-Hydroxy-8-[[4'-[[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphtyl]azo]-1,1'-biphenyl-4-yl]azo]-1,3-naphthalenedisulfonic acid trisodium salt

4-(4-Aminophenyl)benzenamine double nitriding, respectively with the 7-Hydroxynaphthalene-1,3-disulfonic acid and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

dark blue purple. Soluble in water (for dark purple), ethanol and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in blue, diluted dark purple for blue-ray, precipitation. Dyes to 10% hydrochloric acid solution for shallow dark purple; Add 10% sodium hydroxide solution micro red.

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