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Methods and ink compositions for invisibly printed security images having multiple authentication features

  • US 20040233465A1
  • Filed: 04/05/2004
  • Published: 11/25/2004
  • Est. Priority Date: 04/04/2003
  • Status: Active Grant
First Claim
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1. A method of marking an article with image indicia for authentication, information, or decoration, the method comprising the steps of:

  • a) providing a plurality of inks that, when printed as image indicia on an article, fluoresce with a color when exposed to excitation energy and are substantially invisible under illumination within the visible spectrum;

    b) separating colors of the image indicia into a plurality of image levels; and

    c) printing each image level of said plurality of image levels in mutual registration on the article using said plurality of inks.

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