| abstract |
[PROBLEMS] To realize super high penetration with pigment ink and good images with very little blurring on various recording media, especially plain paper, recycled paper, and even recording media having a glossy layer on the surface thereof. To provide a possible ink composition. A pigment comprising at least a pigment, a water-soluble organic solvent, and water, wherein the pigment can be dispersed and / or dissolved in water without a dispersant in which a phenol compound is added to the pigment by a radical reaction. And an aqueous pigment ink composition comprising a water-soluble cationic polymer or oligomer. [Selection figure] None |