To obtain the subject composition hardly generating gaseous substance and preferable for charging to an applicator such as a traffic line marker by compounding an alkylamine in an ink composition.

This composition includes (C) ≥0.1 wt.% and preferably ≤2.0 wt.% alkylamine having at least one 5-20C alkyl group in an ink composition including (A) a colorant and (B) a solvent. It is preferable to use a metal azo dye or the like as the component A, ethanol or the like as the component B and N-coconut oil alkylpropanediamine, N-ethylene oxide-N'-coconut oil alkylpropanediamine or the like as the component C.