| abstract |
To provide an ink capable of forming an image excellent in solvent resistance, water resistance, and abrasion resistance. An ink containing a coloring material, water, an organic solvent, and urethane resin particles, and a weight of an ink film obtained by drying the ink before and after being immersed in a 25% by weight ethanol aqueous solution, Is an ink having a film swelling degree calculated based on <Formula 1> Membrane swelling degree (%) = 100 × [(BA) / A] In Formula 1, A represents the mass of the ink film before immersion, and B represents the mass of the ink film after immersion. [Selection figure] None |