Enhanced Visualization of Latent Fingermarks on Rough Aluminum Surfaces Using Sequential Au and Zn/ZnS/ZnO Depositions

Journal of Forensic Sciences
Anjani Kumar TiwariS Anantha Ramakrishna

Abstract

Detection and visualization of fingermarks on rough and diffuse surfaces is a relatively challenging task. We succeeded in developing latent fingermarks on scratched and rough aluminum surfaces by sequential deposition of a thin layer of gold followed by one of zinc or zinc-based compounds on the fingermarks. The best image enhancement was achieved with sequential Au and ZnS depositions. Using this combination, we could enhance the visualization of latent fingermarks aged over 65 days in normal conditions. The optical reflectance from the fingermarks with the deposited layers of metal/dielectric is analyzed as a stratified medium. Significant contrast in the reflectance from the regions of the ridges and the valleys of the fingermark would enhance the visualization. Our results show that the Au and ZnS bi-layer combination can have a large reflection contrast and improved fingermark visualization at wavelengths corresponding to the green light for specific thickness of ZnS.

References

Mar 6, 1954·Nature·S ODEN, B VON HOFSTEN
Aug 20, 2010·Forensic Science International : Synergy·I-Heng YuJeh Shane Liao
Feb 11, 2011·Journal of Forensic Sciences·Akhlesh LakhtakiaDrew P Pulsifer
Jun 26, 2012·Forensic Science International : Synergy·Aline GirodCéline Weyermann
Apr 20, 2013·Forensic Science International : Synergy·Jhuma DuttaI Mekkaoui Alaoui
Jan 10, 2014·Journal of Forensic Sciences·Sarah A MuhlbergerRobert C Shaler

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Citations

Jan 2, 2021·Forensic Science International : Synergy·Andy BécueChristophe Champod
Nov 2, 2020·Forensic Science International : Synergy·Jessica N PollittJason W Birkett

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