Luminol is a chemical that exhibits a striking blue chemiluminescence when mixed with an oxidizing agent. In this example, a solution of luminol, sodium hydroxide, and water is mixed with a solution of potassium ferricyanide, hydrogen peroxide, and water. The potassium ferricyanide acts as a catalyst to produce molecular oxygen from the hydrogen peroxide, which then oxidizes the luminol. Light is given off as a byproduct of the oxidation.
Luminol is most commonly used in forensic investigations to detect trace amounts of blood left at crime scenes. It reacts with the iron found in red blood cells to catalyze its brilliant blue glow.
Source: https://youtu.be/xlO1awr3-9E
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