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[Humidity as a necessary condition for latent fingerprint detection with ninhydrin--a practice-oriented and

Lothar Schwarz1, Mona-Lena Hermanowski

  • 1Aus dem Kriminaltechnischen Institut des Bundeskriminalamtes Wiesbaden.

Archiv Fur Kriminologie
|March 24, 2010
PubMed

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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