During the fermentation process, when yeast turn grapes into wine, sulfur can sometimes get turned into compounds called thiols that can make your wine smell terrible. These compounds, called thiols, can make your wine smell icky.
Does fermenting wine smell bad?
When a wine has a bad odor during fermentation, it is usually because excessive amounts of gaseous compounds such as hydrogen sulfide where produced by the wine yeast during the fermentation. ... Fermenting your wine at too warm of a temperature can cause these bad odors to occur in a wine.
How do you know if wine fermentation is bad?
Signs that something is not right:
- A moldy, musty smell like wet dog or cardboard. ...
- A taste of vinegar. ...
- Chemical smells like acetone (nail polish remover) and sulfur (rotten eggs). ...
- A red wine is brownish and a white wine has a tinge of brown. ...
- The cork is pushed up a little or there is leakage around the cork.
