2. Because tea is rich in tea polyphenols, polyphenols, vitamin C and carotene, it is easy to be oxidized, so environmental temperature, relative humidity, smell, light, air and microorganisms will affect the quality of tea. In order not to deteriorate, we must pay attention to: avoid high temperature, high humidity, light and oxygen.
The materials used to preserve tea in daily life include aluminum foil composite bags, utensils and their combinations. Tin pots are the best utensils, as are other pottery pots and metal boxes. It is best to put a proper amount of special preservative for tea in the packaging bag to keep the tea in the composite bag fresh.
Of all the tea leaves, green tea is best kept in the refrigerator. If the storage time is short and you need to drink it at any time, you can put the green tea in the refrigerator and adjust the temperature of the refrigerator to about 5 degrees Celsius. But if it is unopened tea, if you want to keep it for more than one year, you should put it in the freezer. In addition, because tea is good at absorbing taste, in order to prevent tea from becoming a "deodorant" in the refrigerator, tea should be sealed and packed before being put into the refrigerator, and the packaging bag should be filled with enough special preservatives. Aluminum foil composite bag is the best packaging material. It should be noted that don't open the package immediately after taking out the tea leaves from the refrigerator. The correct way is to take the tea out of the refrigerator, let it warm up slowly, open the packaging bag after reaching normal temperature (usually every other day), and then brew it for drinking. And it is best to drink it within half a month.
Compared with green tea, oolong tea, black tea and jasmine tea don't need to be kept in the refrigerator. Oolong tea and black tea are easy to preserve because of their low content of tea polyphenols and slow aging and deterioration; However, scented tea has a strong floral fragrance, and low-temperature storage will inhibit its aroma and reduce its freshness and concentration. Therefore, as long as it is placed in a dry, sealed, light-proof and odor-proof container, it can be preserved for a long time. Pu 'er tea is best stored at room temperature, and no desiccant is needed.