| 摘要 |
An ink-jet recording ink including a colorant dispersible in water, a water-soluble organic solvent used as a wetting agent, a surfactant, a penetrant, a water-dispersible resin, and water, wherein when 2.5 g of the ink is weighed, placed in a glass Petri dish having a diameter of 33 mm and stored for 24 hr at a temperature of 50° C.±0.5° C. and a humidity of 12%±5%, the evaporation rate of a solvent (water+water-soluble organic solvent) in the ink is 50% by weight or more, and an ink residue has a viscosity of 20,000 mPa-S or greater, and wherein by storing the ink residue for 6 hr at a temperature of 23° C.±0.5° C. and a high humidity of 95%±3% to allow it to absorb moisture, the amount of moisture contained in the ink residue becomes 30% by weight to 40% by weight, in which case the ink residue has a viscosity of less than 500 mPa s.
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