ACID BLACK 52

black powder

4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazo, and Naphthalen-2-ol matches, will result in aqueous solution with formic acid chromium common heating, in 115 ℃ keep 2 hours, and then into the same batch of have no complexation half of the dyes, and sodium hydroxide move into alkaline, drying. The component of product is about 2 to 3 Moore single atoms chromium azo dyes.

black. Dark brown powder. A red light black soluble in water, soluble in ethanol and soluble fiber element, slightly soluble in acetone, insoluble in other organic solvents. Meet strong sulfuric acid is dark, dilute to create black precipitation; Meet nitric acid was yellow brown solution; In a rare dark-purple sodium hydroxide solution. Used for wool, polyamide, silk dyeing and printing, also used in leather and electrochemical dyeing aluminum shading.

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6-7	4	4	4-5	4		4-5
AATCC	7	3-4	3-4	4-5	3		5