1.15-20 hours.

2. After soaking, use tweezers to remove bark debris, add rock sugar, red dates, wolfberry, etc., and simmer in water for 20-30 minutes.

3. After being soaked, Snow Swallow grows in volume 30-50 times to preserve nutrients without leaking out.

4. The dosage per person is about 5 grams.

5. You can seal it tightly with plastic wrap and put it in the refrigerator.

6. Snow swallow is the pith secretion of the plant of the genus Pinpo. It is called "snow swallow" because it looks like a bird's nest after soaking.

7. Snow swallows mainly grow in China, Myanmar, and Yunnan, China, with a small amount distributed in Vietnam.

8. Snow Swallow is made by manually scratching the trunk of the Pingpo tree, drilling holes to collect the pith secretions, and air-drying them.

9. Snow swallows are as clear as crystal when they are first secreted. After exposure to air and oxidation, the color gradually turns yellow, forming red, black, and brown snow swallows.

10. Due to being blown by the wind, it is easy to stick to impurities such as sand, tree bark and so on.

11. There is a sour smell when the snow swallow is secreted. After the snow swallow is soaked, the sour smell disappears immediately, and there is no sour taste when eaten.