Chemiluminescence is the emission of light with limited emission of heat (luminescence), as the result of a chemical reaction.
A standard example of chemiluminescence in the laboratory setting is found in the luminol test, where evidence of blood is taken when the sample glows upon contact with iron. When chemiluminescence takes place in living organisms, the phenomenon is called bioluminescence. A lightstick emits a form of light by chemiluminescence.
Chemiluminescence takes place in numerous living organisms, the American firefly being a widely studied case of bioluminescence.
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