5-Amino-6-[(2-chlorophenyl)azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo]-1,1'-biphenyl-4-yl]azo]-2,7-naphthalenedisulfonic acid disodium salt

4-(4-Aminophenyl)benzenamine double nitriding, first in alkaline conditions and o-Chloroaniline diazo, in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?and coupled the product of three, and then coupled with phenol.

dark blue light green. Soluble in water for blue light green, soluble in ethanol for green light blue. The strong sulfuric acid in galleries for, for violet after diluted. The dye solution to join strong hydrochloric acid have violet and precipitation; Add thick sodium hydroxide solution for dark green.

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