6661-33-2

3-Amino-4-hydroxybenzenesulfonamide (2 Moore) diazo, and N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea coupling, and then turn it into copper complex.

red to Claret. Soluble in water for red light purple. The strong sulfuric acid in red for Violet, diluted becomes shallow. The dye solution to join strong hydrochloric acid have red light purple precipitation; Add sodium hydroxide to red light purple.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	1-2	4	6-7	2		2