Breathing

What is Breathing? Breathing is the practice of exposing wine to air before drinking, either by uncorking the bottle in advance or by pouring it into a decanter, with the aim of allowing volatile compounds to evaporate and a small amount of oxidation to occur. The technique works through two distinct mechanisms — surface evaporation of notes such as sulfites or burnt-matchstick aromas, and slow oxidation of phenolic compounds that unfolds over hours or days. Its real-world effectiveness, however, is debated, and the ideal duration depends heavily on the wine's age, structure, and grape variety. Simply pulling the cork barely helps; decanting is the genuinely effective method.

How It Works and When to Use It

Pulling the cork alone exposes only the narrow surface at the bottle neck and has almost no measurable effect. Decanting, by contrast, dramatically increases the wine's contact with air and is the method that actually changes how the wine smells and tastes in the short term. Swirling the wine in the glass follows the same surface-area principle on a smaller, more immediate scale, and is often enough for many bottles.

Timing matters more than the act itself. Young, full-bodied tannic reds generally benefit from one to two hours in a decanter, and especially closed wines may need two to three hours to open. Mature wines aged five to fifteen years usually need only five to fifteen minutes, mainly to separate sediment rather than for aeration. Older or fragile wines of fifteen years or more should be decanted around thirty minutes before serving at most — too much oxygen can strip away the remaining aromatics and structure.

Which Wines Benefit and Which Do Not

Wine writer Karen MacNeil points to Barolo, Bordeaux, Cabernet Sauvignon, Rhône wines, and Port as classic candidates for decanting, particularly Vintage Port, which throws heavy sediment in the bottle. Full-bodied whites can also gain from brief aeration, while delicate varieties such as Pinot Noir and Chianti can be harmed by extended air exposure, losing their finer aromatics.

It is also worth being honest about what breathing does not do. Tannin softening is not the result of a few hours in a decanter — polymerization of tannins happens during winemaking and oak aging over days and weeks. Decanting only alters perception by allowing limited oxidation of minor phenolic compounds and the dissipation of volatile sulfites. The oenologist Émile Peynaud famously argued that prolonged oxygen exposure diffuses and dissipates more aroma compounds than it stimulates, and favored immediate swirling in the glass over long breathing in a decanter.