Patent ID: 7798625

Claim:
An active ray curable ink-jet ink set comprising an active ray curable yellow ink, an active ray curable cyan ink, an active ray curable black ink, and further one or more of active ray curable color inks other than yellow, cyan and black, wherein each of the active ray curable yellow ink, the active ray curable cyan ink, the active ray curable black ink, and the active ray curable color inks other than yellow, cyan and black, contains a photo-polymerization initiator, a photo-polymerizable compound, a pigment, and a dispersing agent which has an amine value and an acid value, provided that the acid value is higher than the amine value, and an average particle diameter of the pigment contained in the yellow ink is larger than an average particle diameter of the pigment contained in the cyan ink and an average particle diameter of the pigment contained in the black ink by 0.025-0.090 μm, and further an average particle diameter of the pigment contained in each of the inks of the active ray curable ink-jet ink set is 0.070-0.220 μm.