6373-17-7

1,2,5,8-Tetrahydroxyanthracene-9,10-dione in the presence of sodium hydroxide with ammonia treatment.

red light navy blue (chromium). Soluble in water and ethanol for red light purple. In concentrated sulfuric acid to red light purple, dilution after orange brown. Dye aqueous solution to join concentrated hydrochloric acid with brown precipitation; Join concentrated sodium hydroxide solution for skipper.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	6-7	4	4	3	4	3