25 March 1996 Fingerprints on counterfeit currency
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tao Lin, Tao Lin, E. Roland Menzel, E. Roland Menzel, } "Fingerprints on counterfeit currency", Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); doi: 10.1117/12.236188; https://doi.org/10.1117/12.236188

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