With hundreds of white grape varieties to choose from, winemakers have the freedom to create a virtually endless assortment of blended wines. In many European regions, strict laws are in place determining the set of varieties that may be used, but in the New World experimentation is permitted and encouraged. Blending can be utilized to create complex wines with many different layers of flavors and aromas, or to create more balanced wines. For example, a variety that is soft and full-bodied may be combined with one that is lighter with naturally high acidity. Sometimes small amounts of a particular variety are added to boost color or aromatics. Blending can take place before or after fermentation, with the latter, more popular option giving more control to the winemaker over the final qualities of the wine.