Patent ID: 8740369

Claim:
An ink composition comprising water, a water-dispersible pigment, a water-soluble organic solvent, a surfactant and a water-soluble silicate, an amount of the water-soluble silicate being from 0.0001% by mass to 0.5% by mass with respect to a total mass of the ink composition, and the water-soluble organic solvent comprising a water-soluble organic solvent having a value of solubility parameter (SP) of 27.5 or less in an amount of 70% by mass or more with respect to a total mass of the water-soluble organic solvent, wherein the water-soluble silicate is represented by the following Formula (A): x (A 2 O). y (SiO 2 ) Formula (A) wherein, in Formula (A), A represents sodium, potassium or tetraalkyl ammonium (NR 4 ); when A represents sodium or potassium, x represents 2, and represents 1 or 3; when A represents tetraalkyl ammonium (NR 4 ), R represents an alky 1 group having from 1 to 4 carbon atoms, x represents 1 or 2, and y represents an integer from 1 to 4.