Putrefaction
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Putrefaction is the decomposition of animal proteins, especially by anaerobic microorganisms. Decomposition is a more general process. It results usually in amines such as putrescine and cadaverine, which have a putrid odor. Material that is subject to putrefaction is called putrescible.
In alchemy, putrefaction is the same as fermentation, basically meaning to allow the substance to rot or decompose.
See also
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