Patent ID: 6280513
Filing Date: 2001-08-28
Classification: B41J,C09D

Abstract:
An ink for forming a print image having an optical density on a recording medium by an ink-jet method, wherein the ink comprises at least one salt selected from the group consisting of (M1).sub.2 SO.sub.4, CH.sub.3 COO(M1), Ph--COO(M1), (M1)NO.sub.3, (M1)Cl, (M1)Br, (M1)I, (M1).sub.2 SO.sub.3, and (M1).sub.2 CO.sub.3, wherein M1 is an alkali metal, ammonium or organic ammonium and Ph is a phenyl group, and a self dispersing carbon black; andwherein the concentration of the carbon black is such that the optical density of the image cannot be obtained when no salt is contained in the ink.