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The biochemical process of fermentation itself creates a lot of residual heat which can take the must out of the ideal temperature range for the wine. Typically, white wine is fermented between 18–20 °C (64–68 °F) though a wine maker may choose to use a higher temperature to bring out some of the complexity of the wine.
A cap of grape skins forms on the surface of fermenting red wine. During the primary fermentation, the yeast cells feed on the sugars in the must and multiply, producing carbon dioxide gas and alcohol. The temperature during the fermentation affects both the taste of the end product, as well as the speed of the fermentation.
Some wine experts contend that the optimal temperature for aging wine is 13 °C (55 °F), [135] others 15 °C (59 °F). [136] Wine refrigerators offer a smaller alternative to wine cellars and are available in capacities ranging from small, 16-bottle units to furniture-quality pieces that can contain 500 bottles.
Winemakers have different opinions about the ideal temperature for fermentation, but in general cooler temperatures (25–28 °C; 77–82 °F) produce fruitier red wines for early drinking while higher temperatures (28–35 °C; 82–95 °F) produce more tannic wines designed for long aging.
A thermometer in use to test the temperature of beer. Gravity, in the context of fermenting alcoholic beverages, refers to the specific gravity (abbreviated SG), or relative density compared to water, of the wort or must at various stages in the fermentation. The concept is used in the brewing and wine-making industries.
For a dry white wine fermentation continues until the sugar runs out. The wine is then usually decanted to eliminate the lees. When fermentation is done in barrels the temperature often exceeds 20 °C or even 25 °C. [46] After the end of fermentation, the wine may also have malolactic fermentation or FML.
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Wine producers wishing to make a wine more approachable within a couple of years will drastically reduce the maceration time to as little as a few days. Following maceration, the Cabernet must be fermented at high temperatures of up to 30 °C (86 °F). The fermentation temperature will play a role in the result, with deeper colours and more ...
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