INK, INK JET RECORDING METHOD, RECORDING UNIT, INK CARTRIDGE, AND INK JET RECORDING APPARATUS

摘要

An ink-jet ink contains at least a coloring material and a specific water-soluble organic solvent and has both excellent coloring property and excellent humidity resistance. The coloring material exhibits a small (9 or less) color difference ”E value which is determined by a method including a series of specific steps and is represented as the square root of (L 1 - L 2 ) 2 + (a 1 - a 2 ) + (b 1 - b 2 ) 2 . The specific water-soluble organic solvent has an evaporation rate X smaller than that of water and a moisture absorptivity Y, the values of X and Y satisfying the relation of Y ‰ 2.8X + 10. The content of the specific water-soluble organic solvent is 50 mass % or more of the total amount of water-soluble organic solvents contained in the ink.