Volume 47, Issue 6 (November 2002)

    Advanced Solvent-Free Application of Ninhydrin for Detection of Latent Fingerprints on Thermal Paper and Other Surfaces

    (Received 6 May 2002; accepted 11 May 2002)

    Published Online: November

    CODEN: JFSOAD

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    Abstract

    This work presents the first known experiments of ninhydrin sublimation in vacuum to detect latent fingerprints on thermal paper. In this method, latent fingerprints become visible in rich detail without the background black staining known from the application of ninhydrin solutions to thermal paper.

    The method involves hanging the thermal paper samples 15 cm above a heating source with dispersed ninhydrin crystals in a vacuum chamber.

    The optimized conditions for ninhydrin sublimation are 50 mg ninhydrin, 2 to 5 mbar vacuum, and 150°C heating source temperature for 30 min. The application of this method is also successful on the new euro notes. Latent fingerprints can be developed across the transitions from paper to optical variable device (OVD).


    Author Information:

    Frerichs, I
    Kriminalistisches Institut des Bundeskriminalamtes, Wiesbaden,

    Schwarz, L
    Kriminalistisches Institut des Bundeskriminalamtes, Wiesbaden,


    Stock #: JFS15559J

    ISSN: 0022-1198

    DOI: 10.1520/JFS15559J

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    Author
    Title Advanced Solvent-Free Application of Ninhydrin for Detection of Latent Fingerprints on Thermal Paper and Other Surfaces
    Symposium , 0000-00-00
    Committee E30