The yeast used to turn grapes into wine or the wild yeast present on the grapes themselves, which some winemakers believe gives their product complex qualities unique to their winery or locale.The yeast converts the fruit's sugars into alcohol and carbon dioxide, which in still wines (no carbon diooxide) is allowed to escape through valves or the surface of open vats.
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| STILL WINE |
To make sweet dessert wines, winemakers stop the fermentation process before all the sugar is consumed. Red wines sometimes undergo a secondary fermentation by lactic acid bacteria, which metabolize sour tasting malic acid into a different acid with a softer flavour.
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| SPARKLING WINE |
Sparkling wines also require a second fermentation process,it takes place in the bottle,where yeast consumes added sugars,producing both alcohol and carbon dioxide.
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