| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a water-based ink composition for a writing instrument excellent in ink temporal stability, pigment dispersibility and metallic luster properties, and to provide a writing instrument using the same.SOLUTION: There is provided a water-based ink composition for a writing instrument containing at least water, a solvent, an aluminum pigment, an acid resin having a carboxyl group, and two or more kinds of pH modifiers, and having pH of 7 to 10.</p> |
