Looking for biological stains

Looking for biological stains

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This image is part of the feature Forensic Science

Credit: MAURO FERMARIELLO/SCIENCE PHOTO LIBRARY

Caption: Looking for biological stains. Forensic scientist using an ultraviolet (UV) lamp to look for stains of biological origin, such as blood, sweat, semen or fingerprints. Biological materials often fluoresce (glow) under UV light, making them more visible. Sometimes a spray is used to add a chemical which will react with certain biological stains and make them more visible under UV light. The red lighting helps to make the fluorescence more visible. Once discovered, the stain can be analysed for DNA and other evidence to help link it to a suspect.

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