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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/21930

Title: Visualisation of latent fingermarks on polymer banknotes using copper vacuum metal deposition: a preliminary study
Authors: Davis, Lloyd W.L.
Kelly, Paul F.
King, Roberto S.P.
Bleay, Stephen M.
Keywords: Fingermark enhancement
Vacuum metal deposition
Polymer banknote
Infrared imaging
Forensic light source
Issue Date: 2016
Publisher: © Elsevier
Citation: DAVIS, L. ... et al, 2016. Visualisation of latent fingermarks on polymer banknotes using copper vacuum metal deposition: a preliminary study. Forensic Science International, 266, pp. e86-e92.
Abstract: The UK's recent move to polymer banknotes has seen some of the currently used fingermark enhancement techniques for currency potentially become redundant, due to the surface characteristics of the polymer substrates. Possessing a non-porous surface with some semi-porous properties, alternate processes are required for polymer banknotes. This preliminary investigation explored the recovery of fingermarks from polymer notes via vacuum metal deposition using elemental copper. The study successfully demonstrated that fresh latent fingermarks, from an individual donor, could be clearly developed and imaged in the near infrared. By varying the deposition thickness of the copper, the contrast between the fingermark minutiae and the substrate could be readily optimised. Where the deposition thickness was thin enough to be visually indistinguishable, forensic gelatin lifters could be used to lift the fingermarks. These lifts could then be treated with rubeanic acid to produce a visually distinguishable mark. The technique has shown enough promise that it could be effectively utilised on other semi- and non-porous substrates.
Description: This paper was accepted for publication in the journal Forensic Science International and the definitive published version is available at http://dx.doi.org/10.1016/j.forsciint.2016.05.037
Version: Accepted for publication
DOI: 10.1016/j.forsciint.2016.05.037
URI: https://dspace.lboro.ac.uk/2134/21930
Publisher Link: http://dx.doi.org/10.1016/j.forsciint.2016.05.037
ISSN: 1872-6283
Appears in Collections:Published Articles (Chemistry)

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