Latent image printing process and apparatus and substrate...

Details Latent image printing process and apparatus and substrate... Latent image printing process and apparatus and substrate...

B - Operations, Transporting

41

M

B41M 3/14 (2006.01) B41M 5/124 (2006.01) B41M 5/165 (2006.01) B41M 5/40 (2006.01) B41M 5/48 (2006.01)

Patent

CA 2152259

A latent image printing method and apparatus uses a substrate with one main surface having a covering comprising only one of a first pair of a color developer and color former dye in at least one selected latent imaging area 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 continuous coating over the covering which is non-porous with respect to the other of the pair and solvent-resistant to the other of the pair. The coating above selected portions of the covering corresponding to a desired latent image is removed.

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