Zinfandel is a variety of black-skinned wine grape. The variety is grown in over 10 percent of California vineyards. The grape found its way to the United States in the mid-19th century, where it became known by variations of the name "Zinfandel", a name which is probably of Austrian origin. The grapes typically produce a robust red wine, and in the United States, a semi-sweet rosé (blush-style) wine called White Zinfandel. The grape's high sugar content can be fermented into levels of alcohol exceeding 15 percent.