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 fortunes of the French wine industry. "(See Influence section below)". The Age of Enlightenment saw an increase in the study and application of winemaking methods with University sponsored studies and treatise on wine related topics. In 1756 the Academy of Bordeaux invited students to write papers on the topic of clarifying wines and the advantages or disadvantages of using egg whites as a fining agent. In Burgundy, the Academy of Dijon sponsored study on ways to improve the quality of Burgundy wine. In the vineyards, vignerons began focusing more on which grape varieties performed best in different areas and augmenting