Solvent-based pen inks
First Claim
Patent Images
1. An eradicable ink comprising an acid dye that decolorizes if contacted with a decolorizing compound, and a solvent system comprising an oxa acid solvent in a sufficient quantity to dissolve the acid dye.
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Abstract
Solvent-based pen inks are provided. The inks include an acid dye and a solvent system that includes an oxa acid solvent, the oxa acid solvent functioning as the primary solvent for the acid dye. Preferred inks are eradicable, and include an acid dye that decolorizes if contacted with a decolorizing compound.
35 Citations
21 Claims
- 1. An eradicable ink comprising an acid dye that decolorizes if contacted with a decolorizing compound, and a solvent system comprising an oxa acid solvent in a sufficient quantity to dissolve the acid dye.
- 15. A solvent based pen ink, comprising an acid dye and a solvent system that includes an oxa acid solvent in a sufficient quantity to dissolve the acid dye.
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18. An eradicator system comprising:
- (a) an eradicable ink comprising an acid dye that decolorizes if contacted with a decolorizing compound, and a solvent comprising an oxa acid solvent; and
(b) an eradictor fluid comprising a compound selected to cause said acid dye to change color. - View Dependent Claims (19, 20)
- (a) an eradicable ink comprising an acid dye that decolorizes if contacted with a decolorizing compound, and a solvent comprising an oxa acid solvent; and
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21. A method of changing the color of an ink mark, comprising
applying an ink to a substrate to provide an ink mark, said ink comprising a solvent system comprising an oxa acid solvent, and an acid dye that changes color if contacted with a chemical agent, dissolved in said solvent, and applying said chemical agent to said ink mark to cause said acid dye to change color.
Specification