Crystalline modification of a water-insoluble monoazo dye

摘要

A water-insoluble monoazo dye represented by the following structural formula [I]having a crystal modification characterized by an X-ray diffraction pattern (CuKalpha) showing one strong peak at a diffraction angle (2theta) of 11.1±0.1° and also four intermediate peaks at 8.1±0.1°, 21.8±0.1°, 23.1±0.1° and 25.2±0.1°.