PURPOSE: To provide an ink for ink jet recording which does not cause cavitation by dissolved oxygen and clogging of a nozzle, prepared by adding a thiophene deriv. and/or ketone to an ink consisting mainly of water, a polyhydric alcohol and a water-soluble dye.

CONSTITUTION: A thiophene deriv. which undergoes autoxidation (e.g. 2-(2-acetylthieno)methyl-4-acetylthiophene) and/or ketone (e.g. piperidone) to an ink consisting mainly of water, polyhydric alcohol (e.g. glycerol) and a water-soluble dye and then pH is adjusted to 10W14 at 20°C by the addition of a basic substance (e.g. NaOH).

EFFECT: The ink is fast-drying, shows quick response to electric signal, insures consistent flow at high speed and does not discolor nor precipitate over a long period.