Formation of security paper e.g. banknote with colored marking involves providing photosensitive preparation comprising substance which produces colloidal metal particles under UV irradiation effect on a portion of the document
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. <IMAGE>
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Alternative title(s) : (de) Verfahren zur markierung von sicherheitspapieren (fr) Procede pour creer des marques sur des papiers de securite (en) Process for providing marking on security papers
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US7514188 | US | B2 | 2009-04-07 |
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