Seeing the invisible: New 'CSI tool' visualizes bloodstains and other substances

Snap an image of friends in front of a window curtain and the camera captures the people -- and invisible blood stains splattered on the curtain during a murder. Sound unlikely? Chemists are reporting development of a camera with that ability to see the invisible, and more. Called multimode imaging in the thermal infrared, the new technology could find uses in crime scene investigations and elsewhere, they say.

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