A colorless liquid that produces a light-emitting reaction when it comes in contact with blood is called:

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Luminol is a chemical substance that is used by forensic investigators to detect trace amounts of blood at crime scenes. When it comes into contact with blood, it produces a light-emitting reaction known as chemiluminescence, which can be detected using specialized equipment. Viagra, Cymbalta, and Vicoprofen are unrelated drugs and do not have any connection to this type of forensic analysis.

A Colorless Liquid That Produces a Light-Emitting Reaction When It