As a sommelier and brewer with years of experience in the industry, I can confidently say that wine does not necessarily go bad after 7 days. However, the quality and taste of wine can deteriorate over time once it is opened. The rate at which this happens depends on various factors such as the type of wine, its alcohol content, and how it is stored.
Let's break it down by different types of wine:
1. Ports: Ports are fortified wines that have a higher alcohol content. Once opened, they can last between 1-3 weeks if stored properly. The higher alcohol acts as a preservative, helping to prolong its shelf life. However, it is important to reseal the bottle tightly and store it in a cool, dark place to maintain its flavor and freshness.
2. Dessert wines: Dessert wines, such as Sauternes or Ice wines, are typically sweet and have a higher sugar content. Due to their sweetness, they can last for about 3-7 days once opened. The sugar acts as a preservative to some extent but can also attract bacteria if not stored properly. It is recommended to keep them refrigerated after opening to slow down the oxidation process.
3. Red and rich white wines: These wines, such as Cabernet Sauvignon or Chardonnay, can last roughly 3-6 days once opened. The tannins and acidity in red wines help to slow down the oxidation process, while the richness of white wines can provide some protection. However, exposure to air will eventually lead to a loss of freshness and flavor. To prolong their shelf life, reseal the bottle tightly and store it in the refrigerator.
It is important to note that these timeframes are general guidelines and can vary depending on the specific wine, storage conditions, and personal preference. Some people may still enjoy a wine even if it has been open for longer than recommended, while others may find it less appealing.
In my personal experience, I have found that the quality of wine can decline after 7 days of being opened. The vibrant aromas and flavors may start to fade, and the wine may become dull and flat. However, this is not always the case, and there have been instances where I have enjoyed a wine that has been open for longer than a week. Taste is subjective, and it ultimately depends on your personal palate and preferences.
To summarize, while wine does not necessarily go bad after 7 days, its quality and taste can deteriorate over time once opened. Ports can last between 1-3 weeks, dessert wines for 3-7 days, and red and rich white wines for roughly 3-6 days. Proper storage, such as resealing the bottle tightly and refrigerating it, can help prolong the lifespan of an opened wine. Ultimately, it is best to trust your senses and taste the wine to determine if it is still enjoyable to you.