1. Look: the middle of the bird's nest is a filiform structure, and the corner of the bird's nest is a flaky structure; Pure bird's nest is not completely transparent, but translucent, whether it is soaked or watched under the light.

2. Smell: Bird's nest has a unique fragrance, but it has no strong smell. Anything with a special smell, fishy smell or greasy smell is fake.

3. Touch: Take a small piece of bird's nest and soak it in water. When it is soft, pull it with silk strips, which has poor elasticity. If it is pulled, it is a fake; Rubbing with your fingers, those that are inelastic and can be rubbed into a paste are also fakes. But after it is completely spread out, it has no elasticity. If it still has good elasticity, it is fake.

4. Burning: The dried bird's nest slices are ignited with fire, and sparks are everywhere. This is the result of protein's burning, and the ashes are black, not the misleading white ashes on the Internet.

Not all bird's nests have medicinal effects. The bird's nest, which is medically recognized as having the medicinal value of yin beauty, relieving cough and asthma, tonifying kidney and benefiting qi, is produced in Indonesia and Malaysia. The old-fashioned bird's nest with the best reputation among consumers in the market is Beijing Tongrentang and Fulinmen, both of which are high-quality bird's nest from Indonesia and Malaysia. If it is a gift, you can choose Tongrentang, which is beautifully packaged, but the price is much more expensive; If it is for the family, it is more affordable to choose Fulinmen, and the quality is good. Other brands of bird's nest are uneven, so consumers are not recommended to buy them.