Bird's nest is divided into white bird's nest and blood bird's nest according to its color, there is no such word as snow bird's nest. White bird's nest is actually a kind of bird's nest whose color will be white as blood bird's nest, but it is not all white, and the inside of the bird's nest will be a bit yellowish. It is generally believed that blood bird's nest is rich in minerals and has a higher nutritional value than white bird's nest, but not all minerals are necessarily beneficial to the human body. However, since blood bird's nest is mostly rusty red, while white bird's nest is mostly milky white. The color of blood is reddish because it absorbs the trace element iron from the rocks during its formation, which is a result of natural changes. As blood bird's nest is expensive due to its small quantity, it is more cost-effective to choose white bird's nest if it is for family's own use. Tongrentang and Fulinmen both have good reputation for their bird's nests, with Fulinmen being the most affordable. In fact, when selecting bird's nest, a good bird's nest, no matter where it is produced, should have a high dryness and will break when slightly folded. The higher the dryness, the easier it is to store, and it will not be moldy if it is placed in a cool place and kept in a sealed place. The hairiness of high-quality bird's nests is usually more than 6 times, and some of them can even reach 8~9 times, depending on the quality of the bird's nests, the time of soaking and the technique. The poor quality bird's nests, however, are treated with medicinal water or brushed with glue, which destroys the texture of the bird's nests and makes them not easy to soak and soak up, and the soaking head is relatively small, and some of them can't even be soaked up at all.

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