Patent ID: 8062412

Claim:
A water-based ink for ink-jet recording comprising a self-dispersing pigment, water, a water-soluble organic solvent, and an acetylene glycol surfactant, wherein an amount of the self-dispersing pigment (solid content) relative to a total amount of the ink is in a range of about 3.5 wt % to about 4.5 wt %, the water-soluble organic solvent comprises glycerin and dipropylene glycol propyl ether, an amount of the glycerin relative to a total amount of the ink is in a range of about 15 wt % to about 25 wt %, and an amount of the dipropylene glycol propyl ether relative to a total amount of the ink is in a range of about 2.0 wt % to about 3.0 wt %, an amount of the acetylene glycol surfactant relative to a total amount of the ink is in a range of about 0.1 wt % to 0.3 wt %.