| 摘要 |
PROBLEM TO BE SOLVED: To provide a writing utensil which realizes a writing process with an ink visualized in a specified color at a writing tip and scarcely shows such a phenomenon, for a long period of time, that an ink liquid is stained by a coloring agent, with regard to the problem with the gradual diffusion and consequent inclusion of the coloring agent in the ink liquid. SOLUTION: This writing utensil is of such a structure that the ink liquid and a main component of the coloring agent for staining the ink liquid are stored separately from each other and are interconnected by a coloring agent adsorbing core 14. This core 14 is formed into a porous bar-shape material composed mainly of an active carbon and a regulating part 9 is provided between the coloring agent adsorbing core 14 and a coloring agent adding core 13 impregnated with the coloring agent. |
