| 摘要 |
There is provided 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. The water based ink 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 from 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.
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