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Color-changing marking composition system

  • US 5,460,647 A
  • Filed: 02/10/1995
  • Issued: 10/24/1995
  • Est. Priority Date: 02/10/1995
  • Status: Expired due to Term
First Claim
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1. A color-changing marking composition system comprising:

  • (a) a first marking composition comprising a wax, a Leuco dye which changes color when contacted with a color change-inducing compound, and a solvent capable of solubilizing the dye; and

    (b) a second marking composition comprising a wax and a color change-inducing compound which induces a color change in the dye when contacted with the dye.

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