Ink, ink-jet recording process, and instrument making use of the ink

摘要

An ink comprises a recording agent and a liquid medium capable of dissolving or dispersing the recording agent, wherein said ink contains both a compound represented by the following Formula (I) and a compound represented by the following Formula (II): <IMAGE> (I) <IMAGE> (II) wherein R1, R2 and R3 each represent an alkyl group or a hydroxyalkyl group, and any one of them may represent a hydrogen atom; X- represents an inorganic acid ion; R4 and R5 each represent a group selected from a hydrogen atom, an alkyl group and a hydroxyalkyl group; and R6 represents a group selected from a carboxyl group, a hydroxyl group, a sulfone group, an alkyl group and a hydrogen atom. The ink is suitably used in the ink-jet recording.