Wine color practice of saignée (exposing wine to red grape skins for only a short period of time in order to give it a lighter feel closer to that of white wine) or by blending a white wine with a red wine. The presence of a complex mixture of anthocyanins and procyanidins can increase the stability of color in wine. As it ages, the wine undergoes chemical autoxidation reactions involving acetaldehyde of its pigments molecules. The newly formed molecules are more stable to the effect of pH or sulfite bleaching. The new compounds include pyranoanthocyanins like vitisins (A and B), pinotins and
Classification of wine Wine Place and Origin, commonly known as the Napa Declaration on Place. This is a "declaration of joint principles stating the importance of location to wine and the need to protect place names". The Declaration was signed in July 2005 by four United States winegrowing regions and three European Union winegrowing regions. The signatory regions from the US were Napa Valley, Washington, Oregon and Walla Walla, while the signatory regions from the EU were: Champagne, Cognac (the commune where Cognac is produced), Douro (the region where Port wine is produced) and Jerez (the region where Sherry is produced). The list