Patent ID: 6960622

Claim:
An ink set comprising (A) a black ink comprising a water-insoluble colorant for a black ink and (B) a color ink comprising a water-insoluble colorant for a color ink, wherein the difference between the maximum average particle diameter and the minimum average particle diameter of the colorants contained in the water-insoluble colorant for a black ink and the water-insoluble colorant for a color ink is at most 25 nm; wherein said water-insoluble colorant for a black ink and said water-insoluble colorant for a color ink are each independently an aqueous dispersion of water-insoluble polymer particles containing a pigment or a hydrophobic dye; and said water-insoluble polymer is a water-insoluble vinyl polymer prepared by copolymerizing a monomer composition comprising a monomer having a salt-forming group, a hydrophobic monomer and a macromer.