| 摘要 |
<p>A water based ink capable of decolorizing or discoloring written or printed letters or images through an organic solvent or heating, which is used for a writing instrument such as roller balls, markers, etc., printing inks, ink jets and the like, comprises a colorant consisting of spherical fine grains colored by a color former, the said spherical fine grains consisting of at least one member selected form polyolefins and other polymers containing, as a constitutional unit, at least one monomer selected from the group consisting of acrylonitrile, styrene, acrylic acid, methacrylic acid, methyl acrylate and methyl methacrylate.</p> |
