| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming method by which ejecting property is stabilized while maintaining the same ejection waveform even when an ink is replaced by another ink having a different colorant concentration to form an image, and an image with excellent qualities can be formed.SOLUTION: An image forming method comprises: forming an image by using an ink set having at least two colors of aqueous inks comprising water, a water-soluble organic solvent, a colorant and a surfactant; and subsequently replacing the ink set by another ink set having at least two colors of aqueous inks comprising water, a water-soluble organic solvent, a colorant and a surfactant to form an image. Color inks included in each ink set show 1 mN/m or less of a difference in the dynamic surface tension when a surface lifetime at 25°C is 1500 ms measured by a maximum bubble pressure method. Each ink set is configured in such a manner that when inks in the same color in the ink sets are compared, the concentration of the colorant included in the inks differs and that a difference in the dynamic surface tension between inks in the same color is 5 mN/m or less when a surface lifetime is 15 ms. |
