Sensitivity Enhancement of Ninhydrin-Treated Latent Fingerprints by Enzymes and Metal Salts

    Volume 31, Issue 2 (April 1986)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 9


    Menzel, ER
    Research associate and director, Center for Forensic Studies, Texas Tech University, Lubbock, TX

    Everse, KE
    Research associate and director, Center for Forensic Studies, Texas Tech University, Lubbock, TX

    (Received 22 March 1985; accepted 3 July 1985)

    Abstract

    Lyophylized Sigma Type III trypsin has been applied to latent prints two weeks to two months old. This trypsin preparation eliminates the background problems that had been encountered with old prints in a previous study. Zinc chloride treatment of latent prints previously exposed to ninhydrin enhances their detectability upon laser examination. However, it has been reported that the zinc chloride reaction occasionally fails to occur. Accordingly, we have investigated the optimization of this reaction. We find that high humidity and elevated temperature, particularly the former, are needed. Cadmium nitrate, although it produces weaker fluorescence than zinc chloride, may at times be useful. Reaction conditions are much the same as those for zinc chloride.


    Paper ID: JFS12274J

    DOI: 10.1520/JFS12274J

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    Title Sensitivity Enhancement of Ninhydrin-Treated Latent Fingerprints by Enzymes and Metal Salts
    Symposium , 0000-00-00
    Committee E30