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Effect of silver (Ag) deposition before physical developer to develop latent fingerprints on wet paper
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2023, v.36 no.6, pp.324-331
https://doi.org/10.5806/AST.2023.36.6.324
(Soonchunhyang University)
(Soonchunhyang University)
(Soonchunhyang University)
(Soonchunhyang University)
(Soonchunhyang University)
(Soonchunhyang University)
(Soonchunhyang University)
Lee,
W., Kang,
M., Le,
Y., &
Yu,
J.
(2023). Effect of silver (Ag) deposition before physical developer to develop latent fingerprints on wet paper. Analytical Science and Technology, 36(6), 324-331, https://doi.org/10.5806/AST.2023.36.6.324
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Abstract
Latent fingerprints on wet paper cannot be developed using amino acid reaction reagents. Therefore, physical developer (PD) or lipid staining reagents like oil red O (ORO) should be utilized. However, ORO is not very effective in developing fingerprints that are older than approximately 4 weeks. On the other hand, PD performs well in developing older fingerprints, but it cannot do so for relatively fresh fingerprints. Additionally, PD has the disadvantage of taking a long time to develop fingerprints. In this study, in order to overcome the limitations of PD, we attempted to increase its reactivity by applying Ag-PD, which involves depositing silver onto paper using vacuum metal deposition (VMD), and compared this with fingerprints developed using ORO and PD. As a result, Ag-PD showed superior fingerprint development compared to ORO and PD on wet paper stored for 2~8 weeks, and the fingerprint development time for PD was significantly reduced to 90~150 seconds.
- keywords
- physical developer, Ag deposition, fingerprints, wet paper, forensic sciences
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