As an expert sommelier and brewer, I can provide you with some insights on how long alcohol can stay in a decanter. While spirits can last years in a decanter, it is generally recommended to consume them sooner rather than later.
Unlike wine, which can quickly oxidize into vinegar within a few days of opening, spirits have a longer shelf life due to their higher alcohol content. The higher alcohol acts as a preservative and helps slow down the oxidation process. However, it is important to note that prolonged storage in a decanter, particularly over two years, can lead to some changes in the quality of the spirit.
Over time, the prolonged exposure to air in a decanter can cause discoloration of the spirit. This is especially true for clear spirits like vodka or gin, which may start to develop a yellowish or brownish tint. While this discoloration doesn't necessarily mean that the spirit is spoiled or unsafe to consume, it can be a sign that the flavors and aromas have started to deteriorate.
In addition to discoloration, long-term storage in a decanter can also result in a loss of flavor intensity. The aromatic compounds that give the spirit its distinct flavors and aromas can gradually evaporate when exposed to air for an extended period. This can result in a muted or dull taste compared to when the spirit was first poured into the decanter.
To ensure the best quality and flavor of your spirits, it is generally recommended to consume them within a reasonable timeframe, ideally within a few months of decanting. This allows you to enjoy the spirit at its peak flavor and aroma profile. If you have a particularly expensive or rare spirit that you want to preserve for a longer period, it may be best to store it in its original bottle with a tight seal to minimize oxidation.
In my personal experience, I have found that certain spirits, such as high-quality aged whiskies or well-aged brandies, can benefit from a short period of decanting. This allows the spirit to breathe and opens up its flavors even more. However, I wouldn't recommend leaving them in a decanter for an extended period as the prolonged exposure to air can still have a negative impact on their quality.
To summarize, while spirits can last years in a decanter, it is advisable to consume them within a few months to enjoy their optimal flavor and aroma. Prolonged storage can lead to discoloration and a loss of flavor intensity. If you have a valuable or rare spirit, it may be best to store it in its original bottle with a tight seal to preserve its quality for a longer period.