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G - Physics

03

G

G03G 13/08 (2006.01) B41M 3/14 (2006.01) G03G 8/00 (2006.01) G03G 9/09 (2006.01) G03G 11/00 (2006.01) G03G 13/01 (2006.01)

Patent

CA 2160356

A method for making security documents using an electro-photographic printer, particularly a photocopier or laser printer, includes the step of exposing the printed image to an accelerator, in liquid or vapour form. Under the influence of the accelerator, a second dye contained in the toner, used in producing the image, migrates into the document, thereby producing a second image in the paper in registration with the printed image. The process is applicable to images created on paper, security paper, and synthetic papers.

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