Patent ID: 8256883

Claim:
A water-based ink for ink jet recording comprising a coloring agent, water, and a water-soluble organic solvent, wherein in the water-based ink after drying, a phase (δ) obtained by a tan δ at a strain amount of about 0.1% to about 100% measured at about 25° C. is constantly about 45 degrees or more; and wherein the phase (δ) after drying in at least one of the following condition (I) and condition (II) is constantly about 45 degrees or more: Condition (I): leave about 1 g to about 10 g of water-based ink at rest under a condition, in which a temperature is about 50° C. to about 70° C. and a relative humidity is about 30% to about 50%, wherein decrease in weight of the water-based ink becomes about 0.01 g or less relative to the water-based ink of 24 hours ago when the weight of the water-based ink is measured every 24 hours; Condition (II): leave water-based ink at rest under a condition, in which a temperature is about 50° C. to about 70° C. and a relative humidity is about 30% to about 50%, for about 7 days or more.