Varietal white wines have been, and are still, more common than varietal red wines. Varietal wines must also be composed of at least 85% of the listed varietal. Examples of grape varieties commonly used in varietal wines are Cabernet Sauvignon, Chardonnay and Merlot. Throughout the United States, Cabernet Sauvignon is made in both varietal and blended styles. However, some producers remained interested in making single varietal red wines. Syrah is used as a single varietal or as a blend. The Languedoc-Roussillon region has taken advantage of its ability to market varietal wines. Today, winemakers are seeking out locations that can highlight the varietal character of Sangiovese. Some of these producers wanted to make Chiantis that were 100% varietal Sangiovese. In Alsace, winemakers adopt the German custom of varietal labeling. No resistant cultivars have been found, but varietal differences in susceptibility have been reported. In the Northern Region of Baja California, Mexico, support the production of the Nebbiolo varietal. Modern Madeiras which do not carry a varietal label are generally made from Negra Mole. It is increasingly celebrated as an Argentine varietal. The green color is caused by traces of chromium, hence the varietal name.