| abstract |
A process for the preparation of deeply colored organic pigments by crystallizing finely divided crude organic pigments, whose primary particles have a size of ≦0.2 μm, in C 3 -C 5 -alkanes, C 3 -C 5 -alkenes or C 1 -C 3 -chloroalkanes at from 40° to 250° C. to under atmospheric pressure or superatmospheric pressure, and isolating the pigment. n The pigments obtained by the process give deep, brilliant colorations. |