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Laser scanning of inks

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Abstract

Luminescence imaging is routinely used in the investigation of suspected documents to identify alterations, erasures, additions, etc. This technique is based on the fact that different inks and papers luminesce differently when excited by a suitable light source. Thus a certain ink and paper combination has a unique luminescence spectral distribution that is different from another one, not only in the spectral shape but in total intensity as well. This property is exploited in the analysis of documents, which in principle can reveal alterations and/or additions.

© 1986 Optical Society of America

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