White wine can be straw-yellow, yellow-green or golden-yellow. Fermentation of uncoloured grape pulp produces white wine. The grapes from which white wine is made are usually green or yellow. Some varieties are well known, such as Chardonnay, Sauvignon and Riesling. Other white wines are blends of several varieties; Tokay, Sherry and Sauternes are examples of such wines. Dark-skinned grapes can be used to produce white wine if the winemaker is careful not to let the skins stain the must during separation of the juice from the pulp. Pinot noir, for example, is commonly used to produce champagne.