Is it safe to drink sherry or port wine that has been opened 6 months but kept sealed and cool?

It's not recommended to drink sherry or port wine that has been open for 6 months, even if it's been sealed and kept cool. Here's why:

* Oxidation: Once opened, the wine is exposed to air, which starts the oxidation process. This can change the flavor, color, and aroma of the wine.

* Evaporation: Over time, the alcohol and water in the wine evaporate, further altering its composition.

* Spoilage: While sealed and cool, the wine is still susceptible to microbial spoilage, especially if not stored properly.

Here are some guidelines for opened sherry and port wine:

* Freshness: Ideally, enjoy these wines within a few weeks of opening.

* Storage: Store them in a cool, dark place with a tight-fitting cork or stopper.

* Signs of spoilage: If you notice any significant changes in the color, aroma, or taste, it's best to discard the wine.

Note: Fortified wines like sherry and port have a higher alcohol content, which helps them age better than other wines. However, they are still susceptible to the effects of oxidation and spoilage over time.

If you have an opened bottle of sherry or port that's been sitting for a while, it's best to err on the side of caution and discard it.