Smell: The real bird's nest has a taste, it should be said that it has a faint fishy smell, or it will have a faint musty smell, because most bird's nests are picked from wooden structures, so it will have a musty smell. However, ventilation is generally enough, and the musty smell will naturally disappear after soaking.

Look: Just look at the Bird's Nest in front of the light source. Normal bird's nest is not airtight, there will be gaps. If it is too dense, be careful. You may brush the glue, and you can also see some small hairs. Because it is impossible to be absolutely clean by manual hair picking, there will be some fine fluff left in the bird's nest. If you can't see any fine hairs at all, it is probably inferior bird's nest treated with chemicals, which is harmful to human body. At the same time, the texture of normal bird's nest should be a little bit, and the color should be grayish white, light yellow or light gray.

Hair: refers to the hair soaked in bird's nest. Hair head is the ratio of the weight of dried bird's nest to the weight of soaked bird's nest. Generally, the hair of high-quality bird's nest is 6 to 8 times, which means that 3 grams of dried bird's nest is soaked in 18 to 24 grams. A bird's nest with too much hair is not all good. It is possible to increase the hair of bird's nest by chemical methods, and we should not blindly pursue high foaming rate.

Stewed: refers to the stewed bird's nest. Generally, bird's nest can be stewed in a saucepan for 25 to 35 minutes. After stewing, there will be a strong protein fragrance, which is an important indicator of true and false bird's nest. Fake bird's nest will not have this fragrant protein flavor. A good bird's nest is thick and has a silky texture inside, which is what everyone calls capsule silk.