Bleed alleviation using pH-sensitive dyes
AssigneeHewlett-Packard Company
InventorsJames P. Shields, Raymond J. Adamic
Life of this patent
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Abstract
Certain dyes become insoluble under specific and well-defined pH conditions. By forcing a dye to become insoluble on the page, migration of the dye is inhibited, thereby helping to reduce bleed between inks of different colors. The dye is forced out of solution from the ink by contact with another ink having the appropriate pH (either higher or lower than that of the first ink).
Claims6
A method of reducing bleed in printing at least two different colors on a print medium from an ink-jet pen, comprising printing a first ink containing a dye that is sensitive to pH and printing a second ink having an appropriate pH to cause said dye of said first ink to precipitate out on said print medium.
Dependencies are inferred from the claim text.