| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball point pen ink that hardly causes blur even after being left to stand for a long period of time in a state exposing a pen point to air in an environment having a temperature change. SOLUTION: The ball point pen ink includes coloring materials, a liquid medium, diaminoanthraquinone, and an ester phosphate. COPYRIGHT: (C)2013,JPO&INPIT |
