PURPOSE: To provide titled ink of high lubricity, smooth in writing touch, comprising water-soluble dye, dicyclohexylamine aliphatic acid salt, water-soluble organic solvent and water.

CONSTITUTION: The objective ink comprising (A) water-soluble dye (e.g. acid dye, direct dye), (B) dicyclohexylamine fatty acid salt (e.g. dicyclohexylamine oleate), (C) water-soluble organic solvent (e.g. ethylene glycol) and (D) water. The amounts of these components are pref. such as to be 1.0W20wt%, 0.05W 5wt%, 10W35wt% and 50W85wt% for the components (A), (B), (C), and (D), respectively, based on the whole amount of the final ink.