| abstract |
PROBLEM TO BE SOLVED: To provide a sufficient density without causing clogging of a nozzle when using it in ink jet recording, to have a sufficient density, and to have excellent water resistance of a recorded matter. To provide an aqueous pigment ink. A water-based pigment ink composition containing oxidized carbon black obtained by wet-oxidizing carbon black with hypohalous acid and / or a salt thereof and a water-soluble resin, wherein the water-soluble resin has a weight Average molecular weight 5000 An aqueous pigment ink composition which is an acrylic copolymer having an acid value of 100 to 250, which is 0 or less. |