Visualization of Latent Fingermark on Metallic Surfaces Based on Displacement Reactions

Abstract

Fingermarks are frequently left on metal surfaces such as kitchen utensils, door handles, or elevator buttons in crime scenes. They are crucial forensic evidence to identify individuals and link them to crimes. Fingermark development on metal surfaces targets either the fingermark residues or the substrate. This study aimed to develop a rapid fingermark development method based on displacement reactions between copper (II) sulphate and various types of metal substrates, such as brass, galvanized iron, and low-carbon steel. Immersion of the metal substrate was more effective in fingermark visualization than applying the solution using a dropper. The optimized concentrations of copper (II) sulphate solution for fingermark visualization were found to be 0.7 M for brass, 0.5 M for galvanized iron, and 0.2 M for low-carbon steel. Sebaceous-rich fingermarks were visualized after the 5th depletion on brass and galvanized iron, and even after the 7th depletion on low-carbon steel. Further improvement is required before incorporating the application of copper (II) sulphate onto metal substrates to visualize fingermarks in real crime cases, due to the destructive nature of substrate submersion.

Keywords

Forensic science / Fingermark development / Metal displacement / Electrochemical reaction

References

[1] Pitera M, Sears VG, Bleay SM, Park S . Fingermark visualization on metal surfaces: An initial investigation of the influence of surface condition on process effectiveness. Sci. Justice 2018, 58, 372-383. doi: 10.1016/j.scijus.2018.05.005.

[2] Barros RM, Oliveira Neto OS, Barbosa RRM, Tonietto A, Jacintho CVM, Del Sarto RP, et al. Using a large-scale cyanoacrylate fuming chamber for latent fingermark detection in vehicles. Aust. J. Forensic Sci. 2022, 55, 645-655. doi: 10.1080/00450618.2022.2057590.

[3] Bleay SM, Kelly PF, King RS, Thorngate SG . A comparative evaluation of the disulfur dinitride process for the visualization of fingermarks on metal surfaces. Sci. Justice 2019, 59, 606-621. doi: 10.1016/j.scijus.2019.06.011.

[4] Liu L, Zhang Z, Zhang L, Zhai Y . The effectiveness of strong afterglow phosphor powder in the detection of fingermarks. Forensic Sci. Int. 2009, 183, 45-49. doi: 10.1016/j.forsciint.2008.10.008.

[5] Masterson A, Bleay S . The effect of corrosive substances on fingermark recovery: A pilot study. Sci. Justice 2021, 61, 617-626. doi: 10.1016/j.scijus.2021.07.004.

[6] Girelli CM, Lobo BJ, Cunha AG, Freitas JC, Emmerich FG . Comparison of practical techniques to develop latent fingermarks on fired and unfired cartridge cases. Forensic Sci. Int. 2015, 250, 17-26. doi: 10.1016/j.forsciint.2015.02.012.

[7] Kaur K, Sharma T, Kaur R . Development of submerged latent fingerprints on non-porous substrates with activated charcoal based small particle reagent. Indian J. Forensic Med. Toxicol. 2020, 14, 388-394.

[8] Trapecar M. Finger marks on glass and metal surfaces recovered from stagnant water. Egypt. J. Forensic Sci. 2012, 2, 48-53. doi: 10.1016/j.ejfs.2012.04.002.

[9] Rohatgi R, Sodhi G, Kapoor A . Small particle reagent based on crystal violet dye for developing latent fingerprints on nonporous wet surfaces. Egypt. J. Forensic Sci. 2015, 5, 162-165. doi: 10.1016/j.ejfs.2014.08.005.

[10] Migron Y, Hocherman G, Springer E, Almog J, Mandler D . Visualization of sebaceous fingerprints on fired cartridge cases: A laboratory study. J. Forensic Sci. 1998, 43, 543-548. doi: 10.1520/JFS16180J.

[11] Christofidis G, Morrissey J, Birkett JW . Using gun blue to enhance fingermark ridge detail on ballistic brass. J. Forensic Identif. 2019, 69, 431.

[12] Morrissey J, Larrosa J, Birkett JW . A preliminary evaluation of the use of gun bluing to enhance friction ridge detail on cartridge casings. J. Forensic Identif. 2017, 67, 313-322.

[13] Wightman G, Emery F, Austin C, Andersson I, Harcus L, Arju G, et al. The interaction of fingermark deposits on metal surfaces and potential ways for visualization. Forensic Sci. Int. 2015, 249, 241-254. doi: 10.1016/j.forsciint.2015.01.035.

[14] Jasuja OP, Singh G, Almog J . Development of latent fingermarks by aqueous electrolytes. Forensic Sci. Int. 2011, 207, 215-222. doi: 10.1016/j.forsciint.2010.10.011.

[15] Wightman G, O’connor D . The thermal visualization of latent fingermarks on metallic surfaces. Forensic Sci. Int. 2011, 204, 88-96. doi: 10.1016/j.forsciint.2010.05.007.

[16] Power GP, Ritchie IM . A contribution to the theory of cementation (metal displacement) reactions. Aust. J. Chem. 1976, 29, 699-709. doi: 10.1071/CH9760699.

[17] Almog J, Cantu AA, Champod C, Kent T, Lennard C . Guidelines for the assessment of fingermark detection techniques, International Fingerprint Research Group (IFRG). J. Forensic Identif. 2014, 64, 174-200.

[18] Ling BYY, Lee YH, Mohammad S, Tan CS . Corrosion of galvanized and ungalvanized cold-formed steel in chloride and sulphate solutions. ASEAN Eng. J. 2023, 13, 145-161. doi: 10.11113/aej.v13.18564.

[19] Girod A, Ramotowski R, Weyermann C . Composition of fingermark residue: a qualitative and quantitative review. Forensic Sci. Int. 2012, 223, 10-24. doi: 10.1016/j.forsciint.2012.05.018.

[20] Chadwick S, Moret S, Jayashanka N, Lennard C, Spindler X, Roux C . Investigation of some of the factors influencing fingermark detection. Forensic Sci. Int. 2018, 289, 381-389. doi: 10.1016/j.forsciint.2018.06.014.

[21] Jasuja OP, Singh K . Visualizing latent fingermarks by aqueous electrolyte gel on fixed aluminum and steel surfaces. Can. Soc. Forensic Sci. J. 2017, 50, 181-196. doi: 10.1080/00085030.2017.1371435.