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Chemiluminescence
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<p>Chemiluminescence (also chemoluminescence) is the emission of light (<a href="/facts/Luminescence/1QkIWyUj">luminescence</a>) as the result of a <a href="/facts/Chemical_reaction/GpqWlKrz">chemical reaction</a>, i.e. a chemical reaction results in a flash or glow of light. A standard example of chemiluminescence in the laboratory setting is the <a href="/facts/Luminol/qIC63W2a">luminol</a> test. Here, <a href="/facts/Blood/03zEulkj">blood</a> is indicated by <a href="/facts/Luminescence/1QkIWyUj">luminescence</a> upon contact with <a href="/facts/Iron/DkICCKIC">iron</a> in <a href="/facts/Hemoglobin/RsD1MzYA">hemoglobin</a>. When chemiluminescence takes place in living organisms, the phenomenon is called <a href="/facts/Bioluminescence/IlzgyV4E">bioluminescence</a>. A <a href="/facts/Light_stick/I0Tapjp9">light stick</a> emits light by chemiluminescence. </p>