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Digital Mapping of Differential Oxidation Arising from Fingerprint Sweat Deposits on α-Phase Brass

Authors:
John W. Bond, Trudy Loe
Journal:
Journal of the Association for Crime Scene Reconstruction
Published:
2011
Abstract:

Visualization of differential oxidation on phase brass, subject to heating to temperatures of up to 600°C, is shown to be enhanced by selective digital mapping of colors reflected from the surface of the brass using Adobe Photoshop. Enhancement is optimal when the brass is heated to ~250°C with areas of oxidation having a mirror like appearance. The use of this enhancement method to visualize fingerprint sweat deposits on brass cartridge cases is demonstrated.

Citation:
Bond, J. W.; Loe, T. Digital Mapping of Differential Oxidation Arising from Fingerprint Sweat Deposits on α-Phase Brass. J. Assoc. Crime Scene Recon., 2011, 17(2), 19-24.
PDF:
Digital Mapping of Differential Oxidation Arising from Fingerprint Sweat Deposits on α-Phase Brass
Keywords:
digital mapping, latent fingerprint, metal corrosion, Photoshop, print visualization

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