Process for providing marking on security papers
AssigneeKBA-Giori S.A.
InventorsPatrik Hoffmann, Tristan Bret, Vincent Moreau
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Abstract
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.
Claims29
A process for providing a security document 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 or colloidal semiconducting particles under the effect of UV irradiation, and wherein said areas are irradiated by means of an UV-light beam so as to produce said colloidal particles.
A security document comprising a photosensitive preparation provided on a portion of the document, wherein said preparation is capable of forming a film on said portion and comprises a substance capable of producing colloidal metal or semiconducting particles under the effect of UV irradiation.
Dependencies are inferred from the claim text.