Eradicable inks
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United States of America Patent
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Jun 29, 1999
Grant Date -
N/A
app pub date -
Mar 25, 1997
filing date -
Mar 25, 1997
priority date (Note) -
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Abstract
An eradicable ink contains an essentially non-aqueous solvent and a colorant, dissolved in the solvent, that changes color if contacted with a sulfite or an amine. Moreover, a water soluble colorant containing a counterion hydrophilic can be converted into a water insoluble colorant by substituting a hydrophobic counterion for the hydrophilic counterion.
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