Open bottle - what does that do to the wine?
Opened bottles change upon contact with oxygen. How quickly this happens depends on the bottle's structure, temperature, and remaining volume.
Cool storage slows down degradation, but does not replace structure.
Conclusion
Open means changed, not automatically corrupted.
As soon as a bottle is opened, the wine begins to interact with the air. In the first few minutes, this can be beneficial: aromas that seemed reserved when closed emerge, and the wine appears more open and rounded. Over hours and days, this process reverses. The oxygen, which initially invigorated, begins to deplete – the fruit loses clarity, the structure becomes flatter, and eventually, oxidative notes emerge, reminiscent of sherry or, in extreme cases, vinegar.
What determines an open wine
How quickly this process unfolds depends on three factors: the wine's structure, the temperature, and the remaining volume in the bottle. A wine with strong acidity and ripe tannins will withstand oxygen longer than a delicate, fruit-driven one. The cooler the bottle is stored, the slower the reactions. And the less air remaining above the wine, the smaller the surface area for attack.
How long each wine lasts
As a rough guide, not a strict rule: Light white and rosé wines, as well as delicate, fruity red wines, usually show their best for two to three days. Structured white wines and full-bodied, tannic red wines often last three to five days, as their acidity and tannins support them. Sparkling wines lose their effervescence after just one to two days, even with a good stopper. Fortified wines like port, however, last for weeks because their higher alcohol protects them.
One exception deserves attention: mature, fragile wines. Especially old bottles that have already reached their peak can change significantly after just a few hours. What has developed over decades often yields to air more quickly than a young, robust wine.
What slows down deterioration
The most effective method is the obvious: reseal the bottle quickly and store it in a cool place – even red wine, which can simply be allowed to return to drinking temperature before the next glass. If you decant the remainder into a smaller, completely full bottle, you reduce the oxygen's surface area. A vacuum pump helps to a certain extent; the most reliable protection is blanketing with an inert gas, which displaces the air.
Our perspective
Open means changed, not spoiled. A wine that tastes different on the second evening is not worse, but at a different point in its short journey in the glass. Because we develop our wines for structure and maturity, they usually find a little more peace when open. Ultimately, your own judgment counts: anyone who follows a wine over two or three evenings learns more about it than any chart can tell.