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
European Union wine regulations wine, with its detailed appellation laws, formed a basis, while also making room for the very different German wine classification system. In general, the EU wine regulations provide for minimum standards across EU, while making it possible for individual member states to enact stricter standards in certain areas in their national wine laws. An example comparing a French and two German wine types made from the same grape variety illustrate what the EU wine regulations stipulate, and how the individual countries have applied various stricter regulations than the minimum for these "quality wines". In a sense, the EU wine regulations