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Method for applying chemical watermarks on substrate

  • US 6,334,678 B1
  • Filed: 09/01/1999
  • Issued: 01/01/2002
  • Est. Priority Date: 09/01/1999
  • Status: Expired due to Term
First Claim
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1. A method for applying a chemical watermark on a substrate, comprising the steps of:

  • supplying a digital printer with an ink comprising a translucentizing agent;

    inserting a substrate in the digital printer; and

    operating the digital printer to apply said ink to said substrate.

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