| 摘要 |
PROBLEM TO BE SOLVED: To provide an aqueous ink composition for writing instrument, which is less likely to affect to a human body and environment, by which microorganisms less likely to grow, and which can be used for a writing instrument on which an ink is often exposed to fresh air, or writing instruments using various kinds of ink supply mechanisms, and which is excellent in safety and storage stability.SOLUTION: The aqueous ink composition for writing instrument comprises: water; a coloring agent; and an antibacterial substance, in which as the antibacterial substance, theaflavin is contained.SELECTED DRAWING: None |
