| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ink composition for making (drawing) rough sketches or rough copies that permits the fair copy of the rough sketch or copy with the normal ink on the rough sketch or copy immediately after the drawing and the trace of the rough drawings loses the color after a certain time in no need of a specific erasing solution, and provide a writing tool filled with the ink composition. <P>SOLUTION: The ink composition comprises an organic solvent as a main component, a resin component, a phthalein coloring agent, and a pH-adjusting agent, and the ink composition is charged in a writing tool. As for the material of the writing tool, the oxygen permeability of the wall faces of the ink storage tank is restricted so that oxygen may not infiltrate into the ink in the storage tank. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
