3,11-dichloroaceanthryleno[2,1-a]aceanthrylene-5,13-dione

3-Chloroanthracen-10(9H)-one with sulfuric acid Oxalaldehyde processing, garnish with Potassium hydroxide Etanol solution alkali fusion, and then sulfate.

Dichloroacedianthrone, Indanthren Red Brown RR, is prepared from 2-chloroanthrone and glyoxal sulfate in chlorobenzene via 2,2'- dichloroanthroneethylene, followed by ring closure in sulfuric acid , .

red light brown. In concentrated sulfuric acid to red light blue; In the basic insurance powder solution for yellow brown; In the acidic insurance powder solution for yellow brown.

Standard	Ironing Fastness	Chlorine bleach	Light Fastness	Mercerized	Oxygen bleach	Soaping
						Fading	Stain
ISO	4	4-5	7-8	4-5	4-5	5	5