As long as the wine doesn't go bad, it tastes good. The method of judging the deterioration of wine: whether the wine is turbid or not, and the normal wine is clear without precipitation; There should be no acetic acid smell in the bouquet. There is basically no problem with wines that meet the above two points. Dry red is made by the complete fermentation of sugar. There is little residual sugar in the wine, which is not sweet to drink. Dry red fermented with skin, grape skin tastes bitter, and dry red bitter is normal. This is related to the place of origin, but it has little to do with it. You can drink it safely. In addition, although dry red is not good to drink, it is more beneficial to human body than sweet wine. I am a food major. You can ask questions if you don't understand anything. I'm glad to answer these questions for you.