Trace element ink spiking for signature authentication Trace element ink spiking for signature authentication Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-072008enSignature 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.Δημοσίευση σε επιστημονικό περιοδικόhttp://creativecommons.org/licenses/by/4.0/Journal of Radioanalytical and Nuclear Chemistry2772399-404 Χατζησταύρος Βασίλειος Hatzistavros Vasilios Kallithrakas-Kontos Nikolaos Καλλιθρακας-Κοντος Νικολαος Akad�miai Kiad� Springer Verlag Signature authentication Inorganic and organometallic ink X-ray fluorescence