| abstract |
The present invention provides a non-aqueous inkjet composite printing method that establishes what should be a guideline in forming a dark composite black, and an ink set that complies with the guideline. In non-aqueous inkjet composite printing in which black ink and at least one color ink are ejected in the same scan, a method for obtaining an image having a high printing density, the black ink including a pigment, a pigment dispersant, and a solvent And the acid value (P A ) and base value (P B ) of the pigment, the acid value of the pigment dispersant (measured using a glass electrode as the indicator electrode and a silver-silver chloride electrode as the reference electrode) A method comprising using a black ink having a D A ) and a base number (D B ) satisfying the following formula (1). | W P Δ P + W D Δ D | <3.0 (1) (Here, Δ P = P A -P B , Δ D = D A -D B, W P is the mass% of the pigment in the ink, W D is the mass% of the dispersant in the ink, P A, P B, D a, a unit of D B is meq / g) [Selection figure] None |