1, authentic gourmet tea, but Xinyang Maojian tea is too hot.

2. Excessive processing.

3. Improper storage of tea leaves leads to gas loss or deterioration: Xinyang Maojian tea is a kind of green tea, which is easy to oxidize when it comes into contact with air. Tea soup contains tea polyphenols, which are more prone to enzymatic oxidation when exposed to air, and become theaflavins (flavins), thearubigins (red) and theabrownins (brown), so the tea soup will turn dark red or dark yellow.

4. Leave a cup of tea for too long after brewing.

5. Fake tea or foreign tea.

6. Aged tea or mixed with aged tea.