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The 8 pages that link to Residual sugar, each with the reason it gives.
WineRelated: Its amount helps determine whether a wine tastes dry, off-dry, or sweet.
Port wineRelated: Its retained grape sugar gives port its characteristic sweetness.
Marsala wineRelated: Residual sugar distinguishes Marsala’s dry, semisweet, and sweet styles.
Sparkling wineRelated: Its amount determines sweetness categories such as brut and demi-sec.
VermouthRelated: Its amount helps distinguish dry, bianco, and sweet vermouth styles.
White wineRelated: Residual sugar is a main determinant of whether a white wine tastes dry or sweet.