The water quality of natural bird's nest will not change after soaking. The quality of yellow water soaked in Huangyan can basically be judged as dyed bird's nest. The true natural bird's nest itself is not very white. We all know that the Bird's Nest was actually built by Jin Siyan with his own saliva and other things. There are some impurities in it, so in fact, bird's nest is generally gray and slightly yellow.

The real bird's nest is cup-shaped regardless of the shape of the capsule silk, and the texture of the bird's nest cup is clear, and the structure of the capsule silk is naturally reticulate. If it is a patched bird's nest, the structure of the capsule silk will be irregular.

After the bird's nest is soaked in water, its volume will expand. Generally, the truly superior bird's nest will be soaked 6-8 times more than before. Of course, the simple foaming multiple is not enough to identify the authenticity of bird's nest, but we can actually observe the specific situation of foaming according to the foaming rate of 6~8 times.

After a good bird's nest is soaked, the filaments are clear and not caked, and the soaked water is not messy. If the bird's nest hair is abnormal, it is likely that there is something wrong with the bird's nest itself. For the foaming of bird's nest, the foaming rate of a good bird's nest cup is generally 6~8 times, and those who fail to reach this foaming rate are generally poor quality or fake bird's nest.

After the bird's nest is soaked, besides the change of volume, the filamentous structure will also change accordingly. Through careful observation, it is not difficult to find that the filamentous structure of bird's nest after soaking in water will change its original impurity arrangement. Simply put, there are a few impurities in the filiform structure of bird's nest before soaking in water, which is also the reason why the real bird's nest is impermeable.

After the bird's nest is soaked, it can also be judged by the shape of the stew. The soaked bird's nest will become bigger if stewed, and the expansion can reach 10~20 times.

The fake bird's nest is not resistant to cooking, and it is mushy after stewing, while the real bird's nest still has obvious filiform even after stewing for a long time. How to choose bird's nest? According to the illustrations of true and false bird's nest before and after soaking, generally speaking, most fake bird's nest can be filtered out. When distinguishing between true and false bird's nest, you can also touch or smell it by hand, mainly to judge the dryness and humidity of bird's nest; Hold the tip of the bird's nest with both hands and bend it gently. If it is easy to bend, it means that the water content is high and the elasticity is poor after soaking. If it is pulled off or your finger is pinched into a paste, it is a fake. If the bird's nest smells pungent when it is bought, it may be blistered by medicine. It is not recommended to buy it.