An ink jet ink contains at least a coloring material and a specific water-soluble organic solvent and has both excellent color developability and excellent humidity resistance. The coloring material exhibits a small (9 or less) color difference ΔE 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
)
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.
一种喷墨墨
水至少包含一种着色物质和一种特定的
水溶性有机溶剂,具有优秀的色彩可发展性和优秀的湿度抗性。着色物质呈现出小的(9或更小)色差ΔE值,该值由包括一系列特定步骤的方法确定,并表示为(L1-
L2)2+(a1-a2)2+(b1-b2)2的平方根。特定的
水溶性有机溶剂具有比
水更小的挥发率X和吸湿性Y,其中X和Y的值满足Y≦2.8X+10的关系。特定
水溶性有机溶剂的含量是墨
水中总
水溶性有机溶剂量的50质量%或更多。