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The fluorescences of biacetyl, acetone, ethyl methyl ketone, and acetaldehyde have been photographed. The main portions, at least, seem to be identical. A like similarity in the fluorescences of diethyl ketone and propionaldehyde suggests that diketones formed during the photolyses of these carbonyl compounds are the fluorescing substances.
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Matheson et al. (1939) studied this question.
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