A raisin is a dried grape. Raisins are produced in many regions of the world and may be eaten raw or used in cooking, baking and brewing Raisin varieties depend on the type of grape used, and are made in a variety of sizes and colors . Seedless varieties include the Sultana , Currants and Flame grapes. Raisins are traditionally sun-dried, but may also be water-dipped and artificially dehydrated. "Golden Raisins" are treated with sulfur dioxide after drying to give them their golden color. sometimes seedless raisins that are much darker and have a tart, tangy flavor. They are often called currants. Muscat raisins are large compared to other varieties, and also sweeter.