Ink for Ink-Jet Recording, Ink-Jet Recording Apparatus, and Method of Treating Nickel-Containing Metal

摘要

An ink for ink-jet recording that is used in an ink-jet recording apparatus. The ink-jet recording apparatus includes an ink-jet head provided with an ink flow passage formed of nickel-containing metal. The ink contains water, a coloring agent, and a polymer. The polymer contains at least one of -COOM and -SO₃M, where M denotes at least one of an alkali metal ion and an ammonium ion.