2-Hydroxy-5-[(4,8-disulfo-2-naphtyl)azo]benzoic acid trisodium salt

3-Aminonaphthalene-1,5-disulfonic acid diazotization, and 2-Hydroxybenzoic acid?coupling.

red light yellow. Soluble in water for yellow, not soluble in organic solvent. In concentrated sulfuric acid for yellow orange; In concentrated hydrochloric acid for yellow orange.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	4	5	4		5	4-5	5