Forgery-proof valuable document and method for its examination

Details Forgery-proof valuable document and method for its examination Forgery-proof valuable document and method for its examination

G - Physics

07

D

G07D 7/12 (2006.01) B44F 1/12 (2006.01) G09F 3/00 (2006.01)

Patent

CA 2643009

The invention concerns a forgery-proof valuable document, in particular a postage stamp, and a method and a device for examining a valuable document. The inventive valuable document (1) contains a two-dimensional area (6) with a security element (2) in the form of a two-dimensional structure. The two-dimensional area (6) is provided with, for example printed with, at least one first and at least one other substance. When illuminated with light that is visible to the human eye, the two substances have the same hue and different hues when illuminated with infrared light. The security element (2) is placed on the valuable document (1) by means of the first substance, the remaining part of the area (6) by means of the at least one other substance. When illuminated with visible light the entire two-dimensional area (6) appears in the same hue. When illuminated with infrared light the security element (2) is optically distinguished from the remaining area.

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