Chroma is increased, color-to-color bleed is reduced, and edge acuity is increase for dye-based inks by an underprinting technique. A dye-based ink-jet ink printing
system is provided, comprising cyan, yellow, and
magenta inks, each ink contained in a separate ink pen. Each ink contains at least one water-soluble dye and vesicles. The vesicles are present in an amount sufficient to contain a substantial fraction of dye molecules within the
water pool of the vesicles. The vesicles formed from a surfactant having a first polarity. The printing
system further comprises an additional pen containing a fixer having a second polarity, opposite to the first polarity. Further, an ink-jet printer that includes the dye-based ink-jet ink printing
system is configured to print the fixer on a print medium, followed by printing at least one ink on the fixer. A method for improving chroma, color-to-color bleed, and edge acuity in a dye-based ink-jet ink. The method comprises: (a) providing the above ink set; (b) providing an additional pen containing a fixer having a second polarity, opposite to the first polarity; (c) printing the fixer on a print medium; and (d) printing at least one ink on the fixer.