Chenpi tea can change in flavor when kept in a thermos for several hours. Whether it is okay to drink depends largely on cleanliness and odor.
Taste Changes
Long holding time can intensify the flavor and increase bitterness.
Cleanliness Notes
- Keep the thermos clean and free of residue.
- If you notice off‑odors, cloudiness, or unpleasant taste, discard it.
- For best flavor, drink within a few hours after brewing.
Overall, use smell and taste as your guide and prioritize clean storage.