The preservation method of opened wine is as follows: 1. The gas covering preservation method is to use the gas heavier than air or liquefied gas to preserve the liquid level in the bottle. This method sometimes requires special equipment, such as a glass separator, to prevent wine from contacting the air by introducing N2 (sometimes effective liquid nitrogen) and argon (plastic gas) heavier than air. Overseas, you can also buy a small steam tank (commonly known as WinePreservationSpray), which looks a bit like an insecticide ceramic tank, and it is usually filled with a mixture of N2, CO2 and argon evaporated under high pressure. The actual effect of the covering method is best kept for 5-6 days.

2. Vacuum preservation method generally uses vacuum valves and vacuum plugs to construct a quasi-vacuum natural environment with low oxygen content according to the residual air in the bottle, thus prolonging the service life of wine. Wine stored in the refrigerator in this way can last longer. If you choose a good vacuum-pumping special tool, it can last for 3-4 days. But when a bottle of wine is less than half left, it won't be so clean.

3. The preservation method of small bottles is to choose beautiful and practical 375mL bulk wine bottles. Friends who usually drink small bottles of wine can wash the bottles and leave them alone. Pour the undrinked wine into a 375ML vial, cover it all the time, and then tighten the cork. This way can basically ensure that the wine can be drunk anytime and anywhere, and it has a new taste.

4. Vacuum plug preservation method Vacuum plug is the most commonly used weapon to protect alcohol. Put the vacuum plug into the bottle, and then use the suction valve to pump out the air in the bottle to keep the vacuum in the bottle, thus prolonging the service life of the wine and storing it in the refrigerator for 3-4 days. However, the quality of vacuum bottle stopper products on the market at present is mixed. If you often have trouble with wine storage, it is recommended to choose a solid quality vacuum plug.

Either way, the storage time of wine can only be temporarily extended, and it needs to be placed under the premise of dry and dark. Therefore, it is better to eat a bottle of wine as soon as possible.