Method for protecting against duplication with a color copier

Details Method for protecting against duplication with a color copier Method for protecting against duplication with a color copier

G - Physics

03

G

G03G 21/04 (2006.01) B41M 3/14 (2006.01) G03G 21/00 (2006.01)

Patent

CA 2160349

A method for protecting against duplication of a document with a color copier comprises providing a background color on a document having an average reflectance value and printing on the background with a contrast color having a spectral characteristic which modulates the average reflectance value by no more than 5 % and has an average value equal to the average reflectance value. The contrast color is printed with a printing medium that allows activation by a rub and reveal action or by application of intense light.

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