Chemically reactive security ink, a method of use of such ink, and security documents incorporating such ink
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United States of America Patent
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Jan 7, 2014
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N/A
app pub date -
May 29, 2007
filing date -
Jun 1, 2006
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Abstract
A document uses a chemically reactive security ink to facilitate security, making it more difficult to alter a genuine security document. The chemically reactive security ink masks a warning word or message on a security document. The hidden warning word or message is revealed when the document is subjected to chemical washing.
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