Mordant Blue 23

(a) 4,8-Diamino-1,3,5,7-tetrahydroxy-9,10-dioxo-9,10-dihydroanthracene-2,6-disulfonic acid?with boiling alkali or dilute acid treatment and changed into sodium salt; (b) 1,5-Dinitroanthracene-9,10-dione in 130 ℃ with fuming sulfuric acid (the sulfur content enough to produce sulfur trioxide) for processing, and then water hydrolysis and changed into sodium salt; (c)1,2,4,5,6,8-Hexahydroxyanthracene-9,10-dione with fuming sulfuric acid sulfonate and changed into sodium salt.

red light navy blue (chromium). Soluble in soluble fiber element and water into wine red, slightly soluble in alcohol, insoluble in benzene, Chloroform, Stout solvent. In concentrated sulfuric acid to fluorescent light red, red after diluted. Dye aqueous solution to join concentrated hydrochloric acid to red; Add thick Nathaniel hydroxide solution for red light blue.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
AATCC		7	3		5	4