This wine defect, which usually occurs after alcoholic fermentation, can result from malolactic fermentation that has not proceeded correctly. Synonyms are butyric acid taint, yoghurt taint, whey taint and sour grape button. Because of the synonym butyric acid taint, it is often wrongly assumed that this is due to the butyric acid contained in the wine (see butyric acid fermentation). Uncontrolled...
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