Process for providing marking on security papers

Details Process for providing marking on security papers Process for providing marking on security papers

B - Operations, Transporting

41

M

B41M 3/14 (2006.01) B42D 15/00 (2006.01) G03C 1/50 (2006.01) G03C 5/08 (2006.01)

Patent

CA 2533477

A process for providing a security paper, in particular a banknote, with a coloured marking, comprising providing a photosensitive preparation on a portion of said document and submitting at least selected areas of said portion to a light beam, wherein said preparation is capable of forming a film on said portion and comprises a substance capable of producing colloidal metal particles under the effect of UV irradiation, and said areas are irradiated by means of an UV-light beam.

La présente invention concerne un procédé permettant de réaliser un marquage de couleur sur du papier fiduciaire, et plus particulièrement sur des billets de banque. En l'occurrence, on applique une préparation photosensible sur une partie du document concerné, et on soumet à un faisceau lumineux des zones sélectionnées de cette partie. Cette préparation, qui se prête à la formation d'un film sur la partie considérée, comprend une substance capable de produire des particules de métal colloïdal sous l'effet du rayonnement ultraviolet, les zones considérées étant exposées au rayonnement d'une lumière ultraviolette.

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