| abstract |
It is an object of the present invention to provide a phthalocyanine pigment composition which has remarkable transparency, gloss and initial viscosity stability in the application of the liquid ink, and has remarkably excellent long-term stability. By using a copper phthalocyanine pigment composition comprising a copper phthalocyanine, a rosin compound, a copper phthalocyanine sulfonic acid or a salt thereof, and an aliphatic amine, and having a calcium content of 200 ppm or less in the pigment composition, to a base ink for a liquid ink, , Gloss, and initial viscosity viscosity in the initial stage of production, as well as remarkably excellent aging stability. |