| abstract |
An object of the present invention is to provide an oil-based pen ink composition which is excellent in writing usability, handwriting density, light resistance, ink stability over time, and pigment dispersibility, and an oil-based refill using the same. The solution of the present invention provides an oil-based pen ink composition which is an oil-based pen ink composition comprising at least a dye, a pigment, and an organic solvent, wherein the dye is selected from the group consisting of alkylbenzenesulfonate. Salt dyes of acid and xanthene basic dyes, salt dyes of alkylbenzenesulfonic acid and triallylethane basic dyes, and alkylbenzenesulfonic acid and methylenimine One or more kinds of salt-forming dyes are selected from the group consisting of salt dyes of basic dyes. |