Facai is the algae of the algae plant Facai . Facai paste is located under the desert plants. It is named “Facai” because of its shape and black color. It is also called “Ground hair”. It is a kind of extremely precious food, known as “the treasure of the Gobi”. Because the algae is a kind of algae, the algae is slender, black-green, and hair-like. It is formed by a series of single-celled individuals buried in a colloidal substance. It is mainly distributed in streams in Ningxia, Shaanxi, Gansu, Qinghai and other places in China. What you see on the market is its dried products.