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Thermal Indicators

  • US 20120262529A1
  • Filed: 12/08/2011
  • Published: 10/18/2012
  • Est. Priority Date: 03/01/2006
  • Status: Active Grant
First Claim
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1. A method of authenticating a thermal media imaging element including a thermally sensitive coating on a substrate, where said thermally sensitive coating changes color upon exposure to heat, comprising:

  • providing said imaging having a security feature including indicia formed over said coating by opaque ink of a color substantially matching that of said imaging element, said indicia being substantially invisible until said coating is exposed to heat; and

    heating said coating to render said indicia visible to authenticate said imaging element.

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