Styryl Dye Coated Metal Oxide Powders for the Detection of Latent Fingermarks on Non-Porous surfaces

Scott Chadwick, Phillip Maynard, Christopher Lennard, Andrew McDonagh, Xanthe Spindler, Claude Roux

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Conventional fingermark powders rely on contrast induced by absorption/reflection (e.g. black powder) or luminescence in the visible region (e.g. Blitz Green®). In most cases, these powders provide sufficient contrast; however, in some circumstances surface characteristics can interfere with the visualisation of powdered fingermarks. Visualisation in the near infra-red (NIR) region, however, has been shown to eliminate interferences commonly encountered in the visible region. In this study, a mixture of rhodamine 6G and the NIR laser dye styryl 11 (STaR 11) was coated onto an aluminium oxide nanopowder and then mixed with silver magnetic powder to develop and visualise fingermarks in the NIR. When compared to Blitz Green®, it was determined that the STaR 11 magnetic powder was better suited for marks deposited on textured surfaces and for older marks, whereas Blitz Green® performed better on smooth glossy surfaces. The ability of the STaR 11 mixed dye formulation to be visualised in both the visible and NIR regions also provides a significant advantage over conventional luminescent fingermark powders
Original languageEnglish
Pages (from-to)208-214
Number of pages7
JournalForensic Science International
Volume219
Issue number1-3
DOIs
Publication statusPublished - 2012

Fingerprint

Powders
Oxides
Coloring Agents
Metals
Dye Lasers
Aluminum Oxide
Luminescence
Silver

Cite this

Chadwick, Scott ; Maynard, Phillip ; Lennard, Christopher ; McDonagh, Andrew ; Spindler, Xanthe ; Roux, Claude. / Styryl Dye Coated Metal Oxide Powders for the Detection of Latent Fingermarks on Non-Porous surfaces. In: Forensic Science International. 2012 ; Vol. 219, No. 1-3. pp. 208-214.
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title = "Styryl Dye Coated Metal Oxide Powders for the Detection of Latent Fingermarks on Non-Porous surfaces",
abstract = "Conventional fingermark powders rely on contrast induced by absorption/reflection (e.g. black powder) or luminescence in the visible region (e.g. Blitz Green{\circledR}). In most cases, these powders provide sufficient contrast; however, in some circumstances surface characteristics can interfere with the visualisation of powdered fingermarks. Visualisation in the near infra-red (NIR) region, however, has been shown to eliminate interferences commonly encountered in the visible region. In this study, a mixture of rhodamine 6G and the NIR laser dye styryl 11 (STaR 11) was coated onto an aluminium oxide nanopowder and then mixed with silver magnetic powder to develop and visualise fingermarks in the NIR. When compared to Blitz Green{\circledR}, it was determined that the STaR 11 magnetic powder was better suited for marks deposited on textured surfaces and for older marks, whereas Blitz Green{\circledR} performed better on smooth glossy surfaces. The ability of the STaR 11 mixed dye formulation to be visualised in both the visible and NIR regions also provides a significant advantage over conventional luminescent fingermark powders",
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Styryl Dye Coated Metal Oxide Powders for the Detection of Latent Fingermarks on Non-Porous surfaces. / Chadwick, Scott; Maynard, Phillip; Lennard, Christopher; McDonagh, Andrew; Spindler, Xanthe; Roux, Claude.

In: Forensic Science International, Vol. 219, No. 1-3, 2012, p. 208-214.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Styryl Dye Coated Metal Oxide Powders for the Detection of Latent Fingermarks on Non-Porous surfaces

AU - Chadwick, Scott

AU - Maynard, Phillip

AU - Lennard, Christopher

AU - McDonagh, Andrew

AU - Spindler, Xanthe

AU - Roux, Claude

PY - 2012

Y1 - 2012

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AB - Conventional fingermark powders rely on contrast induced by absorption/reflection (e.g. black powder) or luminescence in the visible region (e.g. Blitz Green®). In most cases, these powders provide sufficient contrast; however, in some circumstances surface characteristics can interfere with the visualisation of powdered fingermarks. Visualisation in the near infra-red (NIR) region, however, has been shown to eliminate interferences commonly encountered in the visible region. In this study, a mixture of rhodamine 6G and the NIR laser dye styryl 11 (STaR 11) was coated onto an aluminium oxide nanopowder and then mixed with silver magnetic powder to develop and visualise fingermarks in the NIR. When compared to Blitz Green®, it was determined that the STaR 11 magnetic powder was better suited for marks deposited on textured surfaces and for older marks, whereas Blitz Green® performed better on smooth glossy surfaces. The ability of the STaR 11 mixed dye formulation to be visualised in both the visible and NIR regions also provides a significant advantage over conventional luminescent fingermark powders

KW - Forensic Science

KW - Fingerprint Detection

KW - Styryl Dyes

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