S2N2 paper manuscript FINAL revised.pdf (5.19 MB)
Download file

A comparative evaluation of the disulfur dinitride process for the visualisation of fingermarks on metal surfaces

Download (5.19 MB)
journal contribution
posted on 10.07.2019, 14:45 authored by Stephen M. Bleay, Paul KellyPaul Kelly, Roberto S.P. King, S.G. Thorngate
The disulfur dinitride process for fingermark visualisation was first reported a decade ago, with promising results obtained for a range of materials including metals. However, the friction sensitive nature of the material and difficulty of synthesis made routine use difficult. Many of these issues have since been addressed, making equipment and chemicals available to build an understanding of how the effectiveness of disulfur dinitride compares to other fingermark visualisation processes currently used on metal surfaces. This enables more informed advice to be given on selection of processes for treatment of metal items, an area of operational interest that encompasses weapons used in violent crime and the increasing incidence in metal theft. This paper reports a comparative study into the effectiveness of disulfur dinitride, cyanoacrylate fuming, vacuum metal deposition, gun blueing and wet powder suspensions on brass, bronze, copper and stainless steel. Experiments were conducted with the surfaces exposed to a range of environments including long term ageing, water/detergent washing, acetone washing and high temperature exposure. The results indicate that disulfur dinitride is an effective process for fingermark visualisation on metal surfaces, including those exposed to adverse environments, and may offer potential improvements over existing processes for those surfaces. Further work, including pseudo-operational trials, is recommended.

History

School

  • Science

Department

  • Chemistry

Published in

Science & Justice

Volume

59

Issue

6

Pages

606 - 621

Citation

BLEAY, S.M. ... et al, 2019. A comparative evaluation of the disulfur dinitride process for the visualisation of fingermarks on metal surfaces. Science & Justice, 59 (6), pp.606-621.

Publisher

Elsevier BV on behalf of The Chartered Society of Forensic Science © Crown Copyright

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Science & Justice and the definitive published version is available at https://doi.org/10.1016/j.scijus.2019.06.011.

Acceptance date

30/06/2019

Publication date

2019-07-03

Copyright date

2019

ISSN

1355-0306

Language

en