Crystal data for C.I. Pigment Red 2:1'-(2,5-dichlorophenyl)azo-2'-hydroxy-3'-phenylamidonaphthalene

The preliminary single-crystal data and powder pattern are given for C.I. Pigment Red 2. The powder pattern has been indexed from the single-crystal dimensions; the problems of multiple indexing have been reduced by comparison with single-crystal intensities.