Volume 41, Issue 3 (May 1996)

    The Ninhydrin Process in Supercritical Carbon Dioxide

    (Received 16 June 1995; accepted 11 September 1995)

    CODEN: JFSOAD

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    Abstract

    Ninhydrin is a widely used reagent for the development of latent fingerprints on porous surfaces. For the past 20 years 1,1,2-trichlorotrifluoroethane (CFC113) has been used as the solvent of choice in the UK for ninhydrin because of its non-toxicity and non-flammability. With the phasing out of CFC solvents under the terms of the Montreal Protocol on the Control of Ozone Depleting Substances, the need for a suitable replacement has arisen. Supercritical CO2 has been found to be a potential replacement for CFC113 in the ninhydrin process. Furthermore, the present processes are two-stage (impregnation of reagent followed by development in an oven), whereas using supercritical CO2 development of fingerprints can be carried out in one stage.


    Author Information:

    Clifford, AA
    School of Chemistry, The University of Leeds, Leeds, West Yorkshire

    Hewlett, DF
    Police Scientific Development Branch, Home Office, St. Albans, Hertfordshire

    Winfield, PGR
    Police Scientific Development Branch, Home Office, St. Albans, Hertfordshire


    Stock #: JFS13940J

    ISSN: 0022-1198

    DOI: 10.1520/JFS13940J

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    Author
    Title The Ninhydrin Process in Supercritical Carbon Dioxide
    Symposium , 0000-00-00
    Committee E30