An ink composition is manufactured to contain a surfactant having
difference d1 (.sigma..sub.10-.gamma.) which is difference between
dynamic surface tension (.sigma..sub.10) of the solution obtained by
making 0.1 wt % solution dissolved in purified water to be measured by
using a maximum bubble pressure method at the bubble frequency of 10 Hz
at a temperature from 24.degree. C. to 26.degree. C. and static surface
tension (.gamma.) to be measured at a temperature from 24.degree. C. to
26.degree. C. and which satisfies 0 mN/m.ltoreq.d1.ltoreq.15 mN/m. An
image is recorded by applying a voltage to partitions made of a
piezoelectric material thereby applying a pressure to the ink composition
supplied from an ink tank to an ink chamber of an ink head to discharge a
liquid droplet of the ink composition, and depositing the liquid droplet
onto a recording material.