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

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, first in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?coupling, Naphthalen-1-amine again diazo, in alkaline conditions and formation of accidentally coupled nitrogen compounds, and then coupled with phenol.

Properties and Applications

dark green. Soluble in water for the green, and adequate soluble in ethanol is green. The strong sulfuric acid is a deep in the navy, diluted for light gray. The dye solution to join strong hydrochloric acid for a dark grey light green, precipitation, add thick sodium hydroxide solution have olive green precipitation.

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