| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a water ink, with which letters or images written or printed by the use of which can be erased or changed in color with an organic solvent and/or heating. SOLUTION: The water ink comprises a colorant formed by coloring a resinous fine spherical particle, particularly a fine spherical particle comprising one or more polymers selected from polymers or polyolefins each containing, as a structural unit, a monomer selected from the group consisting of acrylonitrile, styrene, acrylic acid, methacrylic acid, methyl acrylate and methyl methacrylate, with a coloring material.</p> |
