Xueyan is the gum of buttonwood, and the commercial gum of buttonwood can be made by collecting and mixing the gums of various tree species. The mountainous areas of Sudan, Senegal, India and Pakistan in Africa are the main producing areas of commercial karaya gum, and there are also a large number of gum-collecting trees in Yunnan, China.
Xueyan is made by cutting the trunk of mallow tree, manually cutting the bark, collecting colloidal secretions and air drying. Snow swallow is as crystal clear as crystal when it is just secreted. When it is oxidized by water, its color deepens, forming red, black and brown snow swallows. Moreover, when the wind blows, 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.
Extended data
Xueyan is a new tonic. Xueyan has the functions of hydrating and moisturizing, reducing fat and moistening intestines, improving human immune regulation, enhancing children's brain development, regulating the growth of human collagen, and making skin plump, firm and elastic. This is a nutritious article. But Xueyan can't eat it every day.
Excessive consumption of blood swallows will be counterproductive and easily lead to various problems such as excessive internal heat and physical discomfort.
Note: The nutritional value of Xueyan can be compared with ginseng and bird's nest, but it is expensive and the output is scarce.
Baidu encyclopedia-Xueyan