Do not drink musty tea. \ x0d \ x0d \ Tea has a shelf life. After the shelf life or improper storage, tea leaves will be moldy, and moldy tea leaves cannot be drunk. Usually, the shelf life of tea in sealed package ranges from 12 months to 24 months, which will be marked on the tea packaging bag. Bulk tea has a short shelf life. It is best to store tea in a well-sealed, cool and dry place with low temperature. The longer Pu 'er and Dahongpao are stored, the more mellow and delicious they are. \x0d\ Tea leaves will change after being stored for a period of time, whether they are vacuum packed or not. The combination of chlorophyll and tea polyphenols in tea will make tea turn yellow and red. If the tea leaves are not dehydrated enough or dried badly at the beginning, the tea soup will become bitter, and even moldy if it is not preserved properly. Therefore, to confirm whether the tea leaves are moldy, you can put the tea leaves in your hands, look at them in a bright place or smell them lightly. If they smell moldy, you shouldn't drink them. They can be used as fertilizer for plants. \x0d\ If the tea leaves taste like tea leaves or have a mixed taste, you can ask a professional tea baking master or tea shop to handle it for you. If the tea has only a little old flavor and has not expired for a long time, it can be solved by brewing. \x0d\ Method 1: The temperature of water should be high, preferably boiled water. The first time I soaked it was a little longer than usual, and then I stopped drinking. The second soaking time is twice as fast as usual. Make it quickly and drink it while it's hot. \x0d\ Method 2: Reduce the water temperature by several degrees and keep the time according to the normal brewing method to avoid the bitter taste of tea soup. \x0d\ Method 3: It's better to change it into a big pot bubble, and you can use a pot mother to reduce the proportion of tea, so that the taste will be better.