Syrah The Syrah-dominated appellations (AOCs) of northern Rhône have, like most other French appellations and regions, no tradition of varietal labeling of their wines. Indeed, such practices are generally disallowed under AOC rules, and only the AOC name (such as Cote-Rotie, Crozes-Hermitage or Hermitage) appears on the label. Varietal labeling of Syrah/Shiraz wines is therefore a practice that has emerged in the New World, primarily in Australia. To confuse matters, in northern Rhône, different clones of genuine Syrah are referred to as "Petite Syrah" (small Syrah) or "Gros Syrah" (large Syrah) depending on the size of their berries, with "Petite Syrah"
Phenolic content in wine grapes varies depending on the variety with Cabernet Sauvignon, Nebbiolo, Syrah and Tannat being 4 of the most tannic grape varieties. The reaction of tannins and anthocyanins with the phenolic compound catechins creates another class of tannins known as pigmented tannins which influence the color of red wine. Commercial preparations of tannins, known as "enological tannins", made from oak wood, grape seed and skin, plant gall, chestnut, quebracho, gambier and myrobalan fruits, can be added at different stages of the wine production to improve color durability. The tannins derived from oak influence are known as "hydrolysable tannins" being created from