Coating processes – Latent image formed or developed
Patent
1985-04-08
1986-12-23
Smith, John D.
Coating processes
Latent image formed or developed
106 21, 427150, 558 1, 434328, B41M 512
Patent
active
046312030
ABSTRACT:
A sharp imaging, non-smearing system for latent imaging and subsequent visual development of printed text or the like is provided which can be used on a variety of substrates (e.g., paper, metal, cloth, synthetic resins) and is extremely stable and easy to use. The system involves first imaging a substrate with an invisible ink containing a dissociable transition metal salt such as CuSO.sub.4, with subsequent application of a liquid developer containing a solubilized color precursor such as thiooxalic amide which complexes with dissociated transition metal ion to give a sharp, virtually instantaneously developing, long lasting color. Depending upon the metal salt selected, different colors can be obtained upon development. The system of the invention can be used in a variety of contexts, such as in self-testing materials or novelty items.
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Schaefer Rolf
Walker, Jr. Haywood A.
Bell Janyce A.
Smith John D.
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