Cold stabilisation is a winemaking process used to reduce the likelihood of tartrate crystals forming in bottled wine. The wine is chilled under controlled conditions so potassium bitartrate crystals precipitate before bottling. The crystals are then removed by racking or filtration. The process is commonly used for white and rosé wines, although methods vary by producer.
Wine is cooled to a temperature selected for its composition and intended stability. Holding the wine cold encourages potassium bitartrate to crystallise and settle or be captured by filtration. The required temperature and holding time depend on the wine, its potassium and tartaric-acid levels, alcohol, pH and the winery’s chosen process.
Tartrate crystals are harmless, but some consumers mistake them for glass or other foreign material. Cold stabilisation reduces the chance of crystals appearing after bottling, especially when bottles are stored or served cold. It is a stability and presentation measure, not a treatment for microbial spoilage.
Cold stabilisation can slightly alter the wine’s acid balance because some tartaric acid is removed as crystals. Producers consider the effect on pH, acidity, flavour and mouthfeel. Some wineries choose alternative or partial stabilisation methods to limit processing.
Example: a winery may cold-stabilise a white wine before bottling so that tartrate crystals are less likely to form when the consumer chills the bottle.
Cold stabilisation targets tartrate crystal formation. Protein stabilisation, often using bentonite in white wine, targets haze caused by unstable proteins. These are different stability issues and may require separate treatments.
Chef’s note: cold stabilisation does not make wine immune to all deposits or faults. A wine can still develop harmless sediment or other changes during bottle ageing.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
