Reactive Black 8

Preparation

2-Amino-4-nitrophenol diazo, and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?coupling, chromium complexation, and 2,4,6-Trichloro-1,3,5-triazine condensation, with four ammonia, and salting-out.

Properties and Applications

blue ash. Black powder. The strong sulfuric acid for purple, diluted still for purple; In nitric acid for black purple, diluted into a navy; Water solution is blue black, add 1 Moore sodium hydroxide solution is still black, continue to join insurance powder into light yellow, add a boric acid sodium is still light yellow. Used for cotton, viscose, linen, silk, polyamide fiber and wool dyeing or of the volume of disseminated and direct printing.

Standard	Light Fastness	Oxygen bleaching		Persperation Fastness		Soaping
		Fading	Stain	Fading	Stain	Fading	Stain
ISO	6 (grey)	3 ( green )	5	4-5 (green)	3	5	6