2. Snow weir is made by manually cutting the trunk of apple tree, punching holes to collect pulp secretion and air drying. Snow swallow is as crystal clear as crystal when it is just secreted. After being oxidized by air, the color gradually turns yellow, forming red, black and brown snow swallows. Because of the strong wind, it is easy to attach impurities such as dust and bark. Xueyan has a sour taste when it is secreted. After the snow weir is soaked, the sour taste disappears immediately, and there is no sour taste when eating.
3. Snow weir is different from rubber. Snow weir is not secreted by tree cortex, but by pith of snow weir tree. Snow goose tree is about 4 meters high, with 5-7 petals, yellow flowers, round fruit, brown hairy, black seeds and peanut size. Xueyan tree blooms from June to 10 every year.
4. It can inhibit sucrose absorption, reduce blood sugar elevation, improve type 2 diabetes, and prevent and treat obesity, hypertension and hyperlipidemia. Therefore, it is expensive and is praised as delicious by health care people.