ACID BLUE 23

(a) 5-Amino-8-bromo-9,10-dioxo-9,10-dihydroanthracene-1,6-disulfonic acid or 8-Amino-5-bromo-9,10-dioxo-9,10-dihydroanthracene-1,7-disulfonic acidand N-(4-aminophenyl)acetamidecondensation; (b) 5-Amino-8-bromo-9,10-dioxo-9,10-dihydroanthracene-1,6-disulfonic acidor8-Amino-5-bromo-9,10-dioxo-9,10-dihydroanthracene-1,7-disulfonic acidandand sodium sulfite deoxidization reaction.

green light blue. The strong sulfuric acid for dark purple, diluted into blue light red

Standard	Light Fastness	Soaping		Persperation Fastness	Oxygen bleaching		Fastness to seawater
		Fading	Stain		Fading	Stain	Fading	Stain
ISO	6	3	5	3	1	2	3	2
AATCC	5-6	4	4	3	1	1	4	4