| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an ink composition, especially an aqueous ink composition for a writing utensil, hardly discolored even when filled in a transparent container with color tone and quantity visually recognizable from outside and exposed to light, with excellent light resistance. <P>SOLUTION: This ink composition comprises at least water, a red xanthene dye, a resonant substance, for example, 1-(2-sulfophenyl)-3-methyl-4,5-dihydroxypyrazole, which contains a sulfone group connected to the xanthene dye by electric attraction and comprises a benzene ring and a pyrazole ring. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
