Chromate(3-),bis[4-(hydroxy-kO)-3-[[2- (hydroxy-kO)-1-naphthalenyl]azo-kN1]-5- nitrobenzenesulfonato(3-)]-,disodium hydrogen

3-Amino-4-hydroxy-5-nitrobenzenesulfonic acid diazo, and Naphthalen-2-ol coupling, and then with aqueous acid chromium heating together, and in 100 ℃ keep 3 ~ 5 hours, make all of its formation chromium complex (1 to 2 Moore single atoms chromium azo dyes).

red light black. Soluble in water for black purple. The strong sulfuric acid for green light black; After diluted for purple brown precipitation. In water solution to join hydrochloric acid is palm orange; With strong sodium hydroxide solution for wine red to deep red wine.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	7-8	3-4	3-4	4-5	3		4-5