A moldy or musty smell in wine is a serious fault likely due to 2,4,6-trichloroanisole, more commonly known as TCA, the culprit in so-called corked wines, which can also devoid wine of its complex flavors and aromas that we seek out so much. Although not a common occurrence in home winemaking, the nasty effects of TCA can be devastating if not prevented, and prevention is the only cure.
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Possible Causes
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Corrective Actions, if any
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The result of a chemical reaction between phenolic compounds in oak wood & wines, and mold or chlorine that produces TCA.
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No corrective action
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There is no corrective action but to dump the wine if the smell is overwhelming.
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