| 摘要 |
An ink-jet ink including 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 having an anionic group pendanted on a mother nucleus selected from a benzylketal type mother nucleus, a benzoine type mother nucleus, an a-hydroxyacetophenone type mother nucleus, and an oxime ester type mother nucleus.
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