Visualisation of latent fingermarks on polymer banknotes using copper vacuum metal deposition: A preliminary study

Journal article


Davis, LWL, Kelly, PF, King, RSP and Bleay, SM (2016). Visualisation of latent fingermarks on polymer banknotes using copper vacuum metal deposition: A preliminary study. Forensic Science International. 266, pp. e86-e92.
AuthorsDavis, LWL, Kelly, PF, King, RSP and Bleay, SM
Abstract

© 2016 Elsevier Ireland Ltd 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.

KeywordsHumans; Copper; Thioamides; Polymers; Dermatoglyphics; Volatilization; Light; Paper
Year2016
JournalForensic Science International
Journal citation266, pp. e86-e92
ISSN0379-0738
Digital Object Identifier (DOI)doi:10.1016/j.forsciint.2016.05.037
Publication dates
Print01 Sep 2016
Publication process dates
Deposited09 Apr 2019
Accepted30 May 2016
Accepted author manuscript
License
CC BY-NC-ND 4.0
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https://openresearch.lsbu.ac.uk/item/87274

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