Documents of value printed to prevent counterfeiting

Details Documents of value printed to prevent counterfeiting Documents of value printed to prevent counterfeiting

1976-06-08

1978-01-03

Pellegrino, Stephen C.

Printed matter

Calendar

427 7, 250461R, B42D 1500

Patent

active

040662802

ABSTRACT:
These documents of value are printed so as to prevent copying, and particularly the counterfeiting of documents of value, with the aid of modern color copiers. For that purpose, part of the material on the document is printed in an ink containing a specularly reflective coloring material, for example, powdered aluminum. The modern color copiers depend upon a color analysis of the light absorbed by various parts of the document, and do not reproduce true colors when they encounter specular reflections from the surface of the document being copied. A specular reflection on the surface of the document being copied results in a product from the color copier which does not faithfully follow the colors on the original document, and hence is readily distinguishable from an original.

REFERENCES:
patent: 3713861 (1973-01-01), Sharp
patent: 3852088 (1974-12-01), Godlewski et al.
patent: 3928226 (1975-12-01), McDonough et al.

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