CAS No.: 116-71-2 Formula: C34H16O2
Weight: 456.49
Synonyms: C.I. 59800; C.I. Pigment Blue 65; C.I. Vat Blue 20; Violanthrone; anthra[9,1,2-cde]benzo[rst]pentaphene-5,10-dione; C.I.Vat Blue 20; Vat Dark Blue BO; Pigment Blue 65; Dibenzanthrone;
Insoluble in water and ethanol, slightly soluble in acetone, chloroform, o-chlorophenol, pyridine, toluene, and soluble in tetrahydronaphthalene and xylene (a reddish-red Chemicalbook fluorescent solution). It is purple-black in concentrated sulfuric acid, and produces a purple-black precipitate after dilution. It is dark purple in alkaline solution of hydrosulfite and dark red in acidic solution.Mainly used for dyeing and printing of cotton fabrics