To provide a pigment formulation for a printing ink, especially an offset printing ink which does not move into a wetting solution and enables to improve the quality of lustering effect and the quantity of a pigment particle moving into the printing ink.

The pigment formulation comprises a BiOCl pigment, one or more lustering pigments, a spherical particle and, if desired, an additive for use in the printing field. The pigment formulation can be used for a printing ink, a securities printing ink, a surface coat, a coating material, a plastics and a cosmetic.