| abstract |
Pigment ink having carbon black as a pigment, good dispersion stability and high image density, an ink cartridge containing the ink, an ink jet recording apparatus equipped with the cartridge, and an image forming method for printing using the recording apparatus And provision of an image formed product. An ink containing at least carbon black, a dispersant, a urethane resin emulsion, and water, wherein the ink has a sulfate ion concentration of 20 to 200 ppm and a nitrate ion concentration of 0.4 to 4 ppm. Pigment ink characterized by. [Selection figure] None |