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The Effects of Polymer Pigmentation on Fingermark Development Techniques

Bacon, Simon R., Ojeda, Jesus J., Downham, Rory, Sears, Vaughn G. and Jones, Benjamin (2013) The Effects of Polymer Pigmentation on Fingermark Development Techniques. Journal of Forensic Sciences, 58 (6). pp. 1486-1494. ISSN 0022-1198

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Abstract

The effectiveness of latent fingerprint development techniques is heavily influenced by the physical and chemical properties of the deposition surface. The use of powder suspensions is increasing for development of prints on a range of surfaces. We demonstrate that carbon powder suspension development on polymers is detrimentally affected by the presence of common white pigment, titanium dioxide. Scanning electron microscopy demonstrates that patches of the compound are clearly associated with increased levels of powder adhesion. Substrates with nonlocalized titanium dioxide content also exhibit increased levels of carbon powder staining on a surface-wide basis. Secondary ion mass spectrometry and complementary techniques demonstrate the importance of levels of the pigment within the top 30 nm. The association is independent of fingermark deposition and may be related to surface energy variation. The detrimental effect of the pigment is not observed with small-particle reagent (MoS2 SPR) or cyanoacrylate (superglue) fuming techniques that exploit different development mechanisms.

Item Type: Article
Additional Information: Author agreement states that embargo is 12 months after acceptance (November 2012)
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
R Medicine > RA Public aspects of medicine > RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine
Schools: School of Applied Sciences
Depositing User: Sara Taylor
Date Deposited: 17 Oct 2013 13:48
Last Modified: 09 Nov 2015 07:05
URI: http://eprints.hud.ac.uk/id/eprint/18980

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