Abstract: An embodiment relates to a chromatic process color inkjet ink containing water, a pigment, an organic solvent, a binder resin, and a wax, in which the organic solvent contains an organic solvent having a boiling point at 1 atmosphere of 190° C. or lower, the organic solvent having a boiling point at 1 atmosphere of 190° C. or lower contains a dihydric alcohol-based solvent and/or a glycol monoalkyl ether solvent, and when an amount of an organic solvent having a boiling point at 1 atmosphere of 150° C. or higher relative to a total amount of ink is S, and an amount contained of the binder resin relative to the total amount of ink is R, the value of S/R is 3.0 or less.

Abstract: An ink set including an inkjet ink, and a treatment liquid used in combination with the inkjet ink, wherein the inkjet ink includes a pigment, a water-soluble organic solvent, a surfactant and water, the treatment liquid includes a coagulant, an organic solvent and water, the coagulant includes calcium nitrate in an amount of 21.5 to 41.7% by mass relative to the total mass of the treatment liquid, an amount of organic solvent having a boiling point at one atmosphere of 240° C. or higher in the treatment liquid is not more than 8% by mass, a pH of the treatment liquid is within a range from 3.5 to 10.5, and a viscosity of the treatment liquid at 25° C. is within a range from 5.5 to 18.5 mPa·s.

Abstract: An ink set including an inkjet ink, and a treatment liquid used in combination with the inkjet ink, wherein the inkjet ink includes a pigment, a water-soluble organic solvent, a surfactant and water, the treatment liquid includes a coagulant, an organic solvent and water, the coagulant includes calcium nitrate in an amount of 21.5 to 41.7% by mass relative to the total mass of the treatment liquid, an amount of organic solvent having a boiling point at one atmosphere of 240° C. or higher in the treatment liquid is not more than 8% by mass, a pH of the treatment liquid is within a range from 3.5 to 10.5, and a viscosity of the treatment liquid at 25° C. is within a range from 5.5 to 18.5 mPa·s.