Styryl dye coated metal oxide powders for the detection of latent fingermarks on non-porous surfaces

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

    Research output: Contribution to journalArticle

    15 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

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