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Term Definition
Ullage

Over time, especially when a wine is not stored correctly (see our 'How to store wine' section in Tools), wine evaporates from the bottle. This is visible by the level of wine reducing towards the shoulders of the bottle. This process is bad for a number of reasons, but primarily because it means that wine is managing to escape through the bottle's seal and because it means that more oxygen is in the bottle - which is not beneficial to wine (see 'oxidation').

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