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Broadly speaking, Wine is made from the juice of grapes and yeast. The yeast converts the grape sugar to alcohol, giving off carbon dioxide, and therefore produces the wine. Whilst this recipe will produce wine, to produce premium (& consistent) wines things tend to get a little more complex. Vigneron's would often add additional ingredients such as sulphur and yeast nutrient. They might also control fermentation temperature, which strains of yeast they use, exposure to oxygen, skin contact, stem contact, the way in which the wine is aged, what it is aged in, etc, etc, etc...

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