Some advances in the silver physical development of latent prints on paper

Antonio A. Cantu; Deborah A. Leben; Kelley Wilson

doi:10.1117/12.498198

22 September 2003 Some advances in the silver physical development of latent prints on paper

Antonio A. Cantu, Deborah A. Leben, Kelley Wilson

Proceedings Volume 5071, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Defense and Law Enforcement II; (2003) https://doi.org/10.1117/12.498198
Event: AeroSense 2003, 2003, Orlando, Florida, United States

Abstract

Silver physical development, a now-abandoned technique used for developing photographic film or paper, is one of the most powerful methods for visualizing latent prints on paper. The method develops the water-insoluble components in the print residue. These components include the “fats and oils” or lipids found on the skin of fingers. The resulting developed print, referred to as a silver physically developed (Ag-PD) print, is made up of (gray to black) silver particles adhered to the fingerprint residue. Such prints are usually intensified (made darker) with a hypochlorite treatment. This process converts silver to silver oxide making the Ag-PD print become a Ag₂O-PD prints. Often such (Ag-PD or Ag₂O-PD) prints are found on areas with heavy or patterned printing making them difficult to see. This work resolves this problem by chemically lightening the print and darkening (suppressing) the interfering background.

Citation Download Citation

Antonio A. Cantu, Deborah A. Leben, and Kelley Wilson "Some advances in the silver physical development of latent prints on paper", Proc. SPIE 5071, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Defense and Law Enforcement II, (22 September 2003); https://doi.org/10.1117/12.498198

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