Printing color images visible under UV light on security documents and valuable articles

R. D. Hersch; P. Donzé; S. Chosson

U.S. Patent No. 8,085,438

A new method of creating fluorescent color images visible under UV light is proposed, which relies on fluorescent colorants obtained by superposing fluorescent ink dots, onjuxtaposed halftoning, and on mapping the gamut of the image to be reproduced into the gamut of the fluorescent colorants. The resulting co lor images are invisible under daylight and have, under UV light, a high resemblance with the original images. Applications comprises the protection of security documents and valuable articles, as weil as publicity, fashion and night !ife, where fluorescent images viewed in the dark under UV illumination have a strongly appealing effect.

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