Protection of legal documents by reverse penetration

Details Protection of legal documents by reverse penetration Protection of legal documents by reverse penetration

B - Operations, Transporting

42

D

283/30

B42D 15/00 (2006.01) B41M 3/14 (2006.01) D21H 21/40 (2006.01)

Patent

CA 1232303

-6- ABSTRACT PROTECTION OF LEGAL DOCUMENTS BY REVERSE PENETRATION A document has a paper substrate with a front surface upon which information is marked in ink. The document is improved to resist alterations by erasure of selected information on its front surface. In the improvement the substrate has a back sur- face upon which the selected information is marked in ink in iden- tical underlay position as the selected information on the front surface. Ink penetrates into the front and back surfaces of the substrate to such an extent in the identical underlay positions that the selected information on the front face may not be erased without damage to the substrate to expose ink penetration from the back surface.

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