4-[[4-[(4-Amino-1-naphtyl)azo]-6-sulfo-1-naphtyl]azo]-1-naphthalenesulfonic acid disodium salt

4-Aminonaphthalene-1-sulfonic acid diazo, and 8-Aminonaphthalene-2-sulfonic acid coupling, its product to diazo, and Naphthalen-1-amine coupling.

brown light black. Soluble in water for deep red, slightly soluble in alcohol. The strong sulfuric acid for blue-black, diluted into a deep red. In water solution to join strong hydrochloric acid is a deep red; Add thick sodium hydroxide solution for deep red.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
AATCC	5	2		3-4	2-3		2