| abstract |
Disclosed is an ink composition, which has excellent storage stability, rarely bleeds, and has good fixability to paper, and with which a clear image can be printed. The ink composition comprises a resin emulsion and a pigment dispersion containing a surface-treated pigment. The surface-treated pigment is obtained by attaching a functional group having a calcium index higher than that of 1,2,3-benzenetricarboxylic acid to the surface of a pigment. The resin emulsion has an electrical conductivity of 300 μS/cm or less when measured in an aqueous solution in which the solid content of the resin emulsion is 1% by mass. |