4,4'-Bis[(2-methyl-1H-indol-3-yl)azo]-1,1'-biphenyl-2,2'-disulfonic acid disodium salt

2,2′-Disulfo-4,4,diaminobibenzene double nitriding, and 2-Methyl-2H-indazole?(2 Moore) coupled.

yellow. Soluble in water, slightly soluble in ethanol lemon yellow. The strong sulfuric acid for lemon yellow, dilute lemon yellow into golden by. Its water solution to join strong hydrochloric acid for gold orange; Add sodium hydroxide for gold orange.

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