The wines of Pomerol have a high composition of Merlot in their blends and are considered the gentlest and least tannic and acidic of Bordeaux wines. Cabernet Franc, known in this area as "Bouchet" is the second leading grape and helps to contribute to the dark, deep coloring that is typical of Pomerol wines. Due to the reduced tannins found in these wines, they can typically be drunk much younger than other red Bordeaux. The chateaux in the area are not classified, with the winemakers seemingly disinclined to devise one, although Château Pétrus is often unofficially grouped with the First Growths of Bordeaux.