The shelf life of homemade wine is mostly two months. Because it is difficult to filter and sterilize homemade wine, it can easily expire. White hairs growing in homemade wine and the wine having a strange odor all indicate that the wine has been infected by stray bacteria.

Wine is fermented by adding yeast to the grape juice. Alcoholic fermentation is the most important stage of winemaking, and its reaction is very complex, in addition to generating alcohol, carbon dioxide, and a small amount of glycerol, high-level alcohols, keto aldehydes, acids, lipids and other ingredients, but also generate many intermediate products such as phosphoric acid.

The temperature is very important when tasting wine. If you drink wine at the optimal temperature, not only can you let the aroma come out completely, but you can also achieve the ultimate in taste balance.

Red wine is usually served at a higher temperature than white wine because it has a thicker flavor than white wine, so it needs a higher temperature to bring out its aroma. Therefore, even a simple red or white wine will have different drinking temperatures depending on the age and sweetness of the wine.

Baidu Encyclopedia - Wine