Fingerprint detection using ninhydrin

Fingerprint detection using ninhydrin

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Credit: PHILIPPE PSAILA/SCIENCE PHOTO LIBRARY

Caption: Fingerprint detection. Forensic scientist dipping a letter in a solution of ninhydrin in order to detect any fingerprints on it. Ninhydrin is a chemical that binds to the proteins in the sweat in fingerprints. It changes colour during this reaction, allowing previously invisible prints to be detected. Ninhydrin is typically used to detect prints on porous surfaces such as paper. Fingerprints are unique to every individual and can thus be used to determine who has handled the letter.

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Keywords: analysis, chemical, crime, detection, dipping, evidence, finger print, fingerprint, fingerprinting, fingerprints, forensic, forensic science, forensic scientist, forensics, human, identifying, lab, laboratory, letter, ninhydrin, paper, people, person, porous surface, print, prints, research, revealing, science, solution, technology, washing

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