There’s a common movie trope of an actor wiping their fingerprints off a gun. It seems like a simple wipe with a cloth eliminates any trace of a criminal’s guilt, but that isn’t actually the case!
Scientists have developed a method that can visualize prints from even the faintest fingerprint deposits left after the metal of a gun is wiped off. This technique uses a colored-electro active film that uses fingerprint residues as a stencil for blocking the electric current. Once a voltage is passed through, the oily regions deflect the colored substances surrounding bare regions, which gives rise to a negative ridge pattern.

#fingerprint #forensics #criminalcase

References:
https://www.amazon.com/Introduction-F...
https://www.compoundchem.com/2016/07/...
https://www.amazon.com/Forensics-Anat...
https://www.amazon.com/Crime-Scene-Co...
https://pubs.rsc.org/en/content/artic...
https://onlinelibrary.wiley.com/doi/a...


Original Article Link: https://www.scienceabc.com/eyeopeners...

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