Trace element ink spiking for signature authentication |
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Authors: | V S Hatzistavros N G Kallithrakas-Kontos |
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Institution: | (1) Technical University of Crete, Laboratory of Analytical and Environmental Chemistry, University Campus, g-73100 Chania, Greece |
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Abstract: | Signature authentication is a critical question in forensic document examination. Last years the evolution of personal computers
made signature copying a quite easy task, so the development of new ways for signature authentication is crucial. In the present
work a commercial ink was spiked with many trace elements in various concentrations. Inorganic and organometallic ink soluble
compounds were used as spiking agents, whilst ink retained its initial properties. The spiked inks were used for paper writing
and the documents were analyzed by a non destructive method, the energy dispersive X-ray fluorescence. The thin target model
was proved right for quantitative analysis and a very good linear relationship of the intensity (X-ray signal) against concentration
was estimated for all used elements. Intensity ratios between different elements in the same ink gave very stable results,
independent on the writing alterations. The impact of time both to written document and prepared inks was also investigated. |
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