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Patent Pending Chemiluminescence (sometimes "chemoluminescence") is the emission of light (luminescence), as the result of a chemical reaction. There may also be limited emission of heat. Given reactants A and B, with an excited intermediate ◊, [A] + [B] → [◊] → [Products] + light For example, if [A] is luminol and [B] is hydrogen peroxide in the presence of a suitable catalyst we have: luminol + hydrogen peroxide → 3-APA[◊] → 3-APA + light where: 3-APA is 3-aminophthalate 3-APA[◊] is the vibronic excited state fluorescing as it decays to a lower energy level.