Coating composition, system including the coating composition, and method for secure images
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United States of America Patent
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Sep 22, 2015
Grant Date -
Jun 24, 2010
app pub date -
Aug 18, 2009
filing date -
Dec 19, 2008
priority date (Note) -
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Abstract
A coating composition, system, and method for printing documents that are difficult to chemically or physically forge and that are easy to visually verify are disclosed. The system includes a substrate, a toner, including a colorant and a dye, a primary migration-enhancing coating applied using an offset printing process and optionally a secondary migration-enhancing coating applied using an offset printing process. An image formed using the toner of the invention is readily verified by comparing a colorant-formed image and a dye-formed image. In addition, if a solvent is used in an attempt to alter the printed image on the substrate, the dye migrates or diffuses to indicate tampering with the document.
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