| abstract |
PROBLEM TO BE SOLVED: To improve the abrasion resistance of an image and the storage stability of an ink while improving the image density of an image formed by ink. According to an embodiment of the present invention, there is provided an ink containing water, a coloring material, an organic solvent having an SP value of 8.0 or more and 13.0 or less, and urethane resin particles, wherein the SP value is 8.0. The organic solvent having a content of not less than 13.0 and not more than 13.0% by mass with respect to the total amount of the ink is contained, and the ink is selected from alkali metal ions and alkaline earth metal ions. The ink contains at least one metal ion, and the total content of the metal ions is 4000 mg / L or more and 8000 mg / L or less based on the total amount of the ink. [Selection diagram] None |