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.