Invisible ink composition and method to ensure document confidentiality
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United States of America Patent
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Sep 21, 2004
Grant Date -
May 15, 2003
app pub date -
Nov 14, 2002
filing date -
Nov 14, 2001
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Abstract
An invisible ink composition and a method to ensure document confidentiality. The invisible ink composition includes a carrier as a solvent; and at least one leuco dye evenly dispersing in the carrier. The invisible ink becomes visible while the leuco dye is combined with a weak acidic developer.
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