Printing color images visible under UV light on security documents and valuable articles
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United States of America Patent
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Dec 27, 2011
Grant Date -
Oct 23, 2008
app pub date -
Apr 23, 2007
filing date -
Apr 23, 2007
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Abstract
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, on juxtaposed halftoning, and on mapping the gamut of the image to be reproduced into the gamut of the fluorescent colorants. The resulting color 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 well as publicity, fashion and night life, where fluorescent images viewed in the dark under UV illumination have a strongly appealing effect.
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