A comparative evaluation of the disulfur dinitride process for the visualisation of fingermarks on metal surfaces
Bleay, S, Kelly, P, King, R and Thorngate, S (2019). A comparative evaluation of the disulfur dinitride process for the visualisation of fingermarks on metal surfaces. Science and Justice.
|Authors||Bleay, S, Kelly, P, King, R and Thorngate, S|
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.
|Journal||Science and Justice|
|Digital Object Identifier (DOI)||doi:10.1016/j.scijus.2019.06.011|
|Web address (URL)||https://www.sciencedirect.com/science/article/pii/S135503061830354X?via%3Dihub|
|03 Jul 2019|
|Publication process dates|
|Deposited||09 Jul 2019|
|Accepted||30 Jun 2019|
|Accepted author manuscript|
CC BY 4.0
Accepted author manuscript
2views this month
0downloads this month