Mercaptan: nm Mercaptan* characterized by this unpleasant taste of rotten eggs, sweat… is an accident, a defect in the wine due to a bad combination between hydrogen and sulfur (hydrogen sulphide) with the alcohol in the wine. The reason is to be found in an excessive reduction of the wine (linked to a lack of aeration): lack of hygiene, poor vinification, new wine left without racking on its yeast lees, etc.
You can remove a mercaptan taste by aerating the wine and putting it ...
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