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Federweißer (from German Feder, "feather", and weiß, "white"; from the appearance of the suspended yeast), is an alcoholic beverage, typically 4 percent alcohol by volume,
but it's not uncommon to see Federweißer in the region of 10 percent alcohol by volume. It is the product of fermented freshly pressed grape juice, known as must.
The term in principle includes all stages of fermentation from must to finished wine.