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A varietal is simply a single type of grape used in wine production. A "varietal wine" is made predominantly from one type (or varietal) of grape. Examples of varietals include Pinot Noir, Riesling, and Syrah. A varietal wine must contain at least 90% of its wine from a single variety of grape. The other 10% may come from blending in other varietals, a practice commonly employed by wineries to produce unique flavors in their wines. This other 10% may also result from a vineyard whose vines containing a few "stray" varietals, which, unless expressly detected, may go unknown for years.