The Detection of Latent Fingerprints Using PCS Gel on Dark-Colored Aluminum Surfaces
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Abstract
Currently, the crime rate in Thailand is rising, and forensic evidence plays an increasingly important role in the justice process. Latent fingerprints are a crucial piece of forensic evidence often found at crime scenes. This research aims to detect latent fingerprints on dark-colored metal surfaces using Electrolyte Gel (PCS Gel) and to study the use of multi-wavelength flashlights to enhance the clarity of fingerprint images. In this study, dark-colored metal surfaces, specifically taupe-colored aluminum sheets and black aluminum sheets, were used for experiments. Various formulations of electrolyte gel were prepared and used, including potassium permanganate, calcium chloride, and silica powder (PCS gel), to detect latent fingerprints on both colors of aluminum surfaces. The results showed that good-quality fingerprints were obtained using the PCS gel, which consisted of 2.5 % w/v potassium permanganate, 0.5% w/v calcium chloride, and 5 grams of silica powder in the total volume of 10 ml solution, with an optimal development time of 25 minutes. For capturing images of latent fingerprints on dark-colored surfaces, the use of multi-wavelength flashlights emitting blue light (λ = 450 nm) significantly improved the visibility of latent fingerprints and the identification of key minutiae features in low-light conditions. The findings from this research can be applied to forensic science, especially for objects with dark metal surfaces in real-life cases.
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References
Ahmad, A. A., Alawadhi, A. H., Park, J., Abdou, H. E., & Mohamed, A. A. (2019). Evaluation of diazonium gold (III) salts in forensic chemistry: Latent fingerprint development on metal surfaces. Forensic Chemistry, 13, 100144. https://doi.org/10.1016/j.forc.2019.100144
Chamsuwanwong, A. (2003). Forensic science 1 for crime investigation (4th ed.). TCG Printing. [in Thai]
Divya, V., Agrawal, B., Srivastav, A., Bhatt, P., Bhowmik, S., Agrawal, K. Y., & Maity, P. (2018). Fluorescent amphiphilic silica nanopowder for developing latent fingerprints. Australian Journal of Forensic Sciences, 52(3), 354–367. https://doi.org/10.1080/00450618.2018.1533036
Fairley, C., Bleay, S. M., Sears, V. G., & NicDaeid, N. (2012). A comparison of multi-metal deposition processes utilising gold nanoparticles and an evaluation of their application to 'low yield' surfaces for finger mark development. Forensic Science International, 217, 5–18. https://doi.org/10.1016/j.forsciint.2011.09.018
Jasuja, O. P., & Singh, K. (2017). Visualizing latent fingermarks by aqueous electrolyte gel on fixed aluminum and steel surfaces. Canadian Society of Forensic Science Journal, 50(4), 181–196. https://doi.org/10.1080/00085030.2017.1371435
Jasuja, O. P., Singh, G., & Almog, J. (2011). Development of latent fingermarks by aqueous electrolytes. Forensic Science International, 207, 215–222. https://doi.org/10.1016/j.forsciint.2010.10.011
Komalasari, I., Krismastuti, F. S. H., Elishian, C., Handayani, E. M., Nugraha, W. C., & Ketrin, R. (2017). Straightforward fabrication of black nano silica dusting powder for latent fingerprint imaging. AIP Conference Proceedings, 1904(1), 020045. https://doi.org/10.1063/1.5011902
Leśniewski, A. (2016). Hybrid organic–inorganic silica-based particles for latent fingermarks development: A review. Synthetic Metals, 222, 124–131. https://doi.org/10.1016/j.synthmet.2016.03.032
Li, F., Li, H., & Cui, T. (2017). One-step synthesis of solid state luminescent carbon-based silica nanohybrids for imaging of latent fingerprints. Optical Materials, 73, 459–465. https://doi.org/10.1016/j.optmat.2017.09.004
Meng, L., Ren, Y., Zhou, Z., Li, C., Wang, C., & Fu, S. (2020). Monodisperse silica nanoparticle suspension for developing latent blood fingermarks. Forensic Sciences Research, 5(1), 38–46. https://doi.org/10.1080/20961790.2018.1446721
Ramos, A. S., & Vieira, M. T. (2012). An efficient strategy to detect latent fingermarks on metallic surfaces. Forensic Science International, 217(1–3), 196–203. https://doi.org/10.1016/j.forsciint.2011.10.047
Rohatgi, R., & Kapoor, A. K. (2016). Development of latent fingerprints on wet non-porous surfaces with SPR based on basic fuchsin dye. Egyptian Journal of Forensic Sciences, 6(2), 179–184. https://doi.org/10.1016/j.ejfs.2015.05.007
Rohatgi, R., Sodhi, G. S., & Kapoor, A. K. (2015). Small particle reagent based on crystal violet dye for developing latent fingerprints on non-porous wet surfaces. Egyptian Journal of Forensic Sciences, 5(4), 162–165. https://doi.org/10.1016/j.ejfs.2014.08.005
Singh, K., & Jasuja, O. P. (2020). Visualization of latent fingerprints by aqueous electrolytes: New developments. Turkish Journal of Forensic Science and Crime Studies, 2(2), 155–170.
Singh, K., Sharma, S., & Garg, R. K. (2013). Visualization of latent fingerprints using silica gel G: A new technique. Egyptian Journal of Forensic Sciences, 3(1), 20–25. https://doi.org/10.1016/j.ejfs.2012.09.001
Song, K., Huang, P., Yi, C., Ning, B., Hu, S., Nie, L., Chen, X., Chen, Z., & Nie, Z. (2015). Photoacoustic and colorimetric visualization of latent fingerprints. ACS Nano, 9(12), 12344–12348. https://doi.org/10.1021/acsnano.5b05629
Yao, K. M., Xu, M., Huang, X. Z., Mo, D. C., & Lyu, S. S. (2023). Electrochemical deposition of copper films to develop the latent sebaceous fingerprints on metal substrates. Journal of Electroanalytical Chemistry, 941, 117526. https://doi.org/10.1016/j.jelechem.2023.117526
Yuan, C., Li, M., Wang, M., & Zhang, L. (2018). Cationic dye–diatomite composites: Novel dusting powders for developing latent fingerprints. Dyes and Pigments, 153, 18–25. https://doi.org/10.1016/j.dyepig.2018.01.055
