Method of protecting security documents

Details Method of protecting security documents Method of protecting security documents

1986-05-23

1987-12-01

Pitts, Harold I.

Registers

Records

235488, G06K 1900

Patent

active

047106174

ABSTRACT:
The method is applicable to protecting security documents of the type comprising a substrate bearing information which is to be protected from tampering, together with transparent protective layers of thermoplastic material heat sealed around said substrate. The method provides a set of pigment-retaining micro-holes in the substrate, said pigment being soluble in protective layer solvents. Any attempt at dissolving away the protective layers to gain access to the support for tampering with the information thereon, will also have the effect of making tell-tale marks on the support, as it absorbs the pigment is spread in the thickness of the support like ink in blotting paper.

REFERENCES:
patent: 4363984 (1982-02-01), Morow et al.

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