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
History of French wine their plantings to capitalize on their findings. Following the French Revolution there was an increase in the amount of poor quality French wine being produced. Jean-Antoine Chaptal, the Minister of the Interior for Napoleon, felt that a contributing factor to this trend was the lack of knowledge among many French vignerons of the emerging technologies and winemaking practices that could improve the quality their wines. In 1801, Chaptal compiled this knowledge into a treatise "Traité théorique et pratique sur la culture de la vigne" which included his advocacy of adding sugar to the wine to increase alcohol levels—a process now