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Latent image printing process and apparatus and substrate therefor

  • US 5,774,160 A
  • Filed: 03/31/1997
  • Issued: 06/30/1998
  • Est. Priority Date: 04/15/1991
  • Status: Expired due to Fees
First Claim
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1. A latent image printing substrate comprising:

  • one main surface having one of a pair of a color developer and color former dye applied thereto and defining a background color in conjunction with the one main surface, wherein the color developer and the color former dye react when mixed to produce a first spectral response which is visible relative to the background color; and

    a covering over said one of the pair which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair, wherein the covering has a melting point of from 50°

    to 200°

    C.

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