disodium 5-amino-4-hydroxy-3-[(2-hydroxy-3,5-dinitrophenyl)azo]naphthalene-2,7-disulphonate

2-Amino-4,6-dinitrophenol diazotization, in alkaline condition and?4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling

Deep green. Soluble in water is purple, not soluble in ethanol. In concentrated sulfuric acid for red, dilution after purple, blue light red precipitation. Dye aqueous solution to join concentrated hydrochloric acid for magenta; With strong caustic is purple.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	2-3	4		5	5	5