| abstract |
An ink-jet ink comprising water, a pigment dispersion, a water-soluble polymerizing or cross-linking substance having an ethylenic unsaturated group, and a water-soluble photo-initiator, wherein the pigment dispersion is anionic, and the photo-initiator is anionic and a cleaving-type photo-initiator selected from a benzylketal type photo-initiator, a benzoine type photo-initiator, an α-hydroxyacetophenone type photo-initiator, and an oxime ester type photo-initiator. |