Method of producing forgery-proof coloured printed articles

B - Operations – Transporting – 41 – M

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B41M 3/14 (2006.01) B44F 1/12 (2006.01) G03C 5/08 (2006.01)

Patent

CA 2110425

Method of producing forgery-proof coloured printed articles Abstract In order to prevent or at least render difficult the copying of coloured printed security papers, for example banknotes, the printing inks used for printing are so formulated that copies made using customary colour copiers produce a markedly different colour impression and can therefore easily be identified as being forgeries. This is achieved by using for the formulation of the printing inks dyes (pigments) that are as different as possible from the dyes (toners) customarily used in conventional colour copiers. The choice of the dyes for the formulation of the printing inks is especially such that there is the greatest possible degree of metamerism between the printing ink in question and the match of the relevant master colour using the dyes of the colour copier. Preferably non- amorphous or anisotropic black dyes and effect dyes, especially fluorescent effect dyes, are co-used for the formulation of the printing inks. (Fig.)

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