OIL-BASED INK COMPOSITION AND BALL-POINT PEN

摘要

PROBLEM TO BE SOLVED: To provide an oil-based ink composition excellent in temporal stability and to provide a ball-point pen. SOLUTION: This oil-based ink composition having a chromic color comprises a dye salt formed by reacting a basic dye with an organic acid, organic pigment and butyral resin at least. The ball-point pen features being filled with the oil-based ink composition having a chromic color.