Further investigations into the single metal deposition (SMD II) technique for the detection of latent fingermarks

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State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_4BDD7585AC3F
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Further investigations into the single metal deposition (SMD II) technique for the detection of latent fingermarks
Journal
Forensic Science International
Author(s)
Newland T. G., Moret Sébastien, Bécue Andy, Lewis S. W.
ISSN
1872-6283
ISSN-L
0379-0738
Publication state
Published
Issued date
2016
Peer-reviewed
Oui
Volume
268
Pages
62-72
Language
english
Abstract
Single metal deposition (SMD II), a recently proposed method for the development of latent fingermarks, was investigated by systematically altering aspects of the procedure to assess their effect on the level of development and contrast achieved. Gold nanoparticle size, temperature of the deposition solution bath, and orbital shaking during detection were shown to affect the levels of development and contrast obtained. Gold nanoparticles of diameter 15–21 nm were found to be most effective for satisfactory visualisation of latent fingermarks, while solutions that were applied at room temperature were found to adequately balance the ratio between the contrast of the fingermark ridge detail and the level of background staining achieved. Finally, optimum levels of development and contrast were obtained through constant agitation of both solution baths at approximately 50 RPM throughout the submersion time. SMD II was also tested on a large variety of substrate types and shown to be effective on a range of porous, non-porous, and semi-porous surfaces; however, the detection quality can be significantly influenced by the substrate nature. This resulted in the production of dark grey, white, or gold coloured fingermarks on different surfaces, as well as reversed detection on certain types of plastic, similarly seen through the use of vacuum metal deposition.
Keywords
Fingermark development, Gold nanoparticles, Nanotechnology, Substrates
Web of science
Create date
07/12/2016 10:26
Last modification date
20/08/2019 14:00
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