In Piedmont, the grape was sometimes used as an "illegal" blending partner with Nebbiolo for DOC classified Barolo with the intention of adding color and more fruit flavors. In the DOCs of Langhe and Monferrato, Cabernet is a permitted blending grape with Nebbiolo as well as Barbera. Wines that are composed of all three grape varieties are often subjected to considerable oak treatment to add a sense of sweet spiciness to compensate for the high tannins of Cabernet Sauvignon and Nebbiolo as well as the high acidity of Barbera. There are varietal styles of Cabernet Sauvignon produce in Piedmont with qualities varying depending on the location. In other regions of northern Italy, such as Lombardy, Emilia-Romagna and Friuli-Venezia Giulia, the grape is often blended with Merlot to produce Bordeaux style blends. In the Veneto region, Cabernet Sauvignon is sometimes blended with the main grapes of Valpolicella-Corvina, Molinara and Rondinella. In southern Italy, the grape is mostly used as a blending component with local varieties-such as Carignan in Sardinia, Nero d'Avola in Sicily, Aglianico in Campania and Gaglioppo in Calabria.