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Forensic investigators use luminol to detect trace amounts of blood at crime scenes, as it reacts with the iron in hemoglobin.

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It contains an oxidizing agent (eg. hydrogen peroxide) and a base. When there is a presence of a catalyst, the reactions produces energy which causes the electrons in the product to higher energy levels before they decrease and release excess energy as light.

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The iron in blood, oxidation by bleach, and enzymes in feces and horseradish trigger luminol's chemiluminscence

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- Horseradish
-Feces
-Urine
-Blood
-Bleach

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Forensic analysts use luminol at gory murder scenes or even suspected abduction scenes. The luminol solution is sprayed all over the scene and as a result a blue luminescence begins to form at the spot where it's triggered.