Name for the by evaporation (Evaporation) Loss of fluid in a wine container occurs, especially in wooden containers but also in nature cork sealed bottles occurs. With wooden barrels, tanks are out stainless steel. Glass or ceramics there is no absolute tightness, but there is a certain exchange of substances (liquid and also in both directions (both outwards and inwards) oxygen ). With old wooden barrels, leaks can occur between the staves a relatively high shrinkage result. The resulting whitespace depending on the type of wine in a barrel young wine regularly filled to be a oxidation to prevent. The tightness of the bung or the position of the bunghole on the barrel. water and alcohol escape to different degrees through the wooden pores. With water molecules, this happens faster, but also from the humidity, the air pressure and the air temperature.
A high moisture content slows the release of water but not alcohol, which results in an increased alcohol in relation to water loss. That usually means that in one wine cellar with ideally high humidity of 70% and more alcohol content reduced in wine. In dry storage, on the other hand, the alcohol content increases. Internationally, especially in the spirits industry, the English term "ullage" for the loss of evaporation of the distillate commonly used due to the breathing wooden barrel. This is also poetically called " angels share ”, Or in France referred to as“ Part des Anges ”. The French term "ouillage" is used both for the shrinkage itself and for the process of filling up. The shrinkage in a bottle, however, is in any case on a leaky or defective cork respectively. shutter due. This results in a lower one filling level, See also under aging. bottle aging and maturity,