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3-Amino-4-hydroxybenzenesulfonic acid?diazo, in alkaline conditions 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?coupling, and copper sulfate complexation, and 2,4,6-Trichloro-1,3,5-triazine condensation, then with phenol or ammonia water condensation.

red light purple. Grey purple powder, the strong sulfuric acid for blue-black, with a small amount of purple, diluted into blue purple; In nitric acid for brown, diluted into light brown. Water solution is red purple, add 1 Moore sodium hydroxide solution for the red still purple; Continue to join insurance powder and warm, first into red, then color disappear; Add a boric acid sodium can’t return to the original colour and lustre. Used for cotton or viscose fiber dyeing and printing directly, can also be used for wool and silk dyeing and printing directly.

Standard	Light Fastness	Oxygen bleaching		Persperation Fastness		Soaping
		Fading	Stain	Fading	Stain	Fading	Stain
ISO	6					5