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Latent fingerprints require special processing techniques to be visible from "summary" of Forensic Fingerprints by Max M. Houck
Latent fingerprints, those impressions left behind by the ridges on the skin of the fingers, are invisible to the naked eye. In order to make these latent prints visible, forensic experts employ special processing techniques. These techniques are necessary to enhance the contrast between the ridges and the background surface, allowing the latent prints to be seen and analyzed. One common method used to develop latent prints is dusting. This technique involves the application of a finely powdered substance, such as black powder or magnetic powder, to the surface where the prints are believed to be located. The powder adheres to the oily residue left behind by the ridges of the fingers, making the latent prints visible. Once the prints are dusted, they can be lifted using adhesive tape or lifted with specialized lifting tools. Another te...
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