It can be distinguished from the color and clarity of the wine, whether there is permeated liquor on the wine bottle, whether there is snow or sediment in the wine, whether the cork is raised, whether the liquor has a strange taste, the taste of the wine and so on.

1. If the color of wine is dull, abnormal brown may not be good, and dark yellow of white wine may not be good.

2. If this bottle of wine oozes, the bottle enters the air and the wine is oxidized, it means that this bottle of wine has been broken;

3. If the wine has a strange unpleasant taste after opening, it also means that the wine has gone bad;

4. When wine has unknown sediment or hops, it may also be one of the reasons for wine deterioration;

The cork of wine bulges for no reason. This may be because the wine is exposed to high temperature, which leads to the increase of air pressure and pushes out the cork.

6. If the wine tastes tasteless, it may indicate that the wine is broken.