Fingerprints on counterfeit currency

Tao Lin; E. Roland Menzel

doi:10.1117/12.236188

25 March 1996 Fingerprints on counterfeit currency

Tao Lin, E. Roland Menzel

Proceedings Volume 2705, Fluorescence Detection IV; (1996) https://doi.org/10.1117/12.236188
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

A number of techniques, including 5-methoxyninhydrin/ZnCl₂, DFO, DMAC, physical developer, colloidal gold, membrane transfer and vapor development, have been explored in an attempt to distinguish between fingerprints on counterfeit currency before and after the inking. Color copying and offset printing counterfeiting were considered. The printing ink proves to be too permeable to permit ready distinction between 'before' and 'after' fingerprints. There are subtle differences between before and after fingerprint fluorescence spectra (5-methoxyninhydrin/ZnCl₂). However, given that one has to contend with finger contamination, the spectroscopy is at present not practically useful, but it shows potential if the fingerprint fluorescence spectrum can be correlated quantitatively with the ink absorption spectrum. Time-resolved spectroscopy in concert with rare-earth-based fingerprint development strategies may be useful as well.

Citation Download Citation

Tao Lin and E. Roland Menzel "Fingerprints on counterfeit currency", Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); https://doi.org/10.1117/12.236188

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