The method of preserving coffee beans tells you a good way to preserve coffee.

Many people have a misconception that storing coffee in the refrigerator is the best way to preserve it. In fact, this is true in principle. However, please think carefully. Every time coffee is taken out of the refrigerator and put back after use, coffee will be affected by different cold and hot temperatures during the process of taking it out of the refrigerator. It may be a good preservation method but become a bad method due to improper operation. If you really want to keep coffee in the refrigerator, it is best to divide the coffee into small portions one by one, and take a packet to brew each time you drink it. The coffee can preserve its flavor. Coffee beans undergo an oxidation process after roasting, which automatically releases carbon dioxide. A good coffee roaster will put freshly roasted coffee beans into a large hemp bag in real time and "bake" them for 12-24 hours to expand the coffee beans to release the sesame oil of the coffee, and then put them into a sealed storage tank, and then package them for sale. Generally placed in the supermarket packaging will use the "vacuum" method, into the "nitrogen", and the use of "one-way vent valve" and other ways to preserve. The shelf life of ordinary coffee beans can be one year, while coffee powder may be 6-9 months, and after opening and drinking, the storage time will be relatively short, but also depends on the storage method. As the name implies,"vacuumizing" means using a vacuum machine to extract the gas from the package, so that residual carbon dioxide and air cannot be left behind, but at the same time, some coffee aroma will also be extracted. The "vacuum" method can preserve the taste of coffee as much as possible, and the preservation time will be longer. Nitrogen is injected into the coffee to blow the air away, by using nitrogen to surround the aroma of coffee beans for original flavor preservation. The "one-way ventilation valve" is to release carbon dioxide from the packaging bag, and prevent air or other gases from entering the packaging bag from the outer layer, thus affecting the taste of coffee. The best way to preserve coffee is to put the original bag into some sealed fresh-keeping bags, and then put it into a sealed bottle with a tight lid. Just put it in a dark and cool storage cabinet. The most important thing is not to have a hot place nearby, such as the oven or refrigerator, so as to prevent the coffee from being heated and causing the coffee to expand again and release carbon dioxide. If a friend bought coffee, you must look carefully at the instructions on the package, because if the coffee is sealed into the "nitrogen" when stored, the coffee must be ventilated for at least 1 hour before drinking, otherwise the taste will be strange.