Colourless, volatile and flammable gas (also hydrogen sulphide or sulphane), which is produced, among other things, during the decomposition of proteins and therefore gives rotten eggs their characteristic odour. It is also found in volcanic gases, natural gas and crude oil. In wine, the foul-smelling and very toxic gas can be produced by fermentation errors due to the conversion of sulphur-containing substances during fermentation. This is particularly dangerous at the end of fermentation because the substance then remains in the wine. During fermentation, it is eliminated by the flushing effect of the carbon dioxide. The cause may be a lack of nitrogen and/or vitamins in the grape must.
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Sigi Hiss
freier Autor und Weinberater (Fine, Vinum u.a.), Bad Krozingen