Vacuum Metal Deposition: Factors Affecting Normal and Reverse Development of Latent Fingerprints on Polyethylene Substrates

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Show simple item record Jones, N Stoilovic, M Lennard, CJ Roux, CP 2009-11-12T04:43:55Z 2001-01
dc.identifier.citation Forensic Science International, 2001, 115 (1), pp. 73 - 88
dc.identifier.issn 0379-0738
dc.identifier.other C1 en_US
dc.description.abstract Vacuum metal deposition (VMD) is an established technique for the development of latent fingerprints on non-porous surfaces. VMD has advantages over cyanoacrylate fuming, especially in circumstances where prints are old, have been exposed to adverse environmental conditions, or are present on semi-porous surfaces. Under normal circumstances, VMD produces `negative prints as zinc deposits onto the background substrate and not the print ridges themselves. A phenomenon of `reverse development, when zinc deposits onto the print ridges and not the background, has been reported by many authors but its causes have not been conclusively identified. Four plastic substrates were used in this study and these could be easily divided into two groups based on the types of development observed as the amount of deposited gold was increased. On group I plastics, identified as low-density polyethylene (LDPE), normal development then reverse development and finally no development resulted with increasing gold. On group II plastics, identified as high-density polyethylene (HDPE), normal development then over-development and finally poor-quality normal development resulted with increasing gold. Our results suggest that the difference between these plastic types causes variations in the gold film structure which in turn dictates the nature of the zinc deposition. On group I plastics, the structure and thickness of the gold film has been identified as the critical factor in the occurrence of normal or reverse development. Thin gold films on plastic substrates form small `clusters (or agglomerates) rather than the atoms being uniformly spread over the surface. The size and shape of these clusters is critical. Once the clusters reach a certain morphology, they no longer act as nucleation sites for zinc, and hence, zinc will not deposit onto the substrate.
dc.publisher Elsevier Science Ireland Ltd
dc.relation.isbasedon 10.1016/S0379-0738(00)00310-8
dc.title Vacuum Metal Deposition: Factors Affecting Normal and Reverse Development of Latent Fingerprints on Polyethylene Substrates
dc.type Journal Article
dc.parent Forensic Science International
dc.journal.volume 1
dc.journal.volume 115
dc.journal.number 1 en_US
dc.publocation Ireland en_US
dc.identifier.startpage 73 en_US
dc.identifier.endpage 88 en_US SCI.Chemistry and Forensic Sciences en_US
dc.conference Verified OK en_US
dc.for 0699 Other Biological Sciences
dc.for 0399 Other Chemical Sciences
dc.personcode 0000016451
dc.personcode 960382
dc.percentage 95 en_US Other Chemical Sciences en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Fingerprint detection, Vacuum metal deposition (VMD), Reverse development, Plastics, Polymer films, Gold deposition, Zinc deposition, Polyethylene
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - Forensic Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of Chemistry and Forensic Science (ID: 339)

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