1,2-Dihydroxy-4-nitro-9,10-anthraquinone

(a) 1,2-Dihydroxyanthraquinone dibenzoate?nitrifying after hydrolysis; (b) 1,2-Dihydroxyanthracene-9,10-dione in sulfuric acid of nitration: (C) 1,2-Dihydroxyanthracene-9,10-dione in Arsenic acid, the presence of hemihydrate?in sulfuric acid of nitration.

dark brown. Soluble in ethanol. In concentrated sulfuric acid for yellow red, dilution after yellow flocks.