Reversibly photochromic printing inks

Details Reversibly photochromic printing inks Reversibly photochromic printing inks

C - Chemistry, Metallurgy

09

D

31/154, 117/6

C09D 11/02 (2006.01) B41M 3/14 (2006.01) C09D 11/00 (2006.01) G03C 1/685 (2006.01)

Patent

CA 1340078

Photochromic printing inks are disclosed which are in particular used for the printing of security documents. Prints are normally nearly colorless and become colored when energy irradiated, such as by ultraviolet light. This photocoloration is reversible. The printing inks contain photochromic compounds which are protected against other ink components. Methods are described to prepare the inks, to print security documents, and to detect counterfeiting.

556404

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