Bird's nest should be a filiform structure, not a bird's nest really composed of flaky structure; Pure bird's nest is not completely transparent, but translucent, whether it is soaked or watched under the light.

Wen'er

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.

Sammo

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.

Sishao

Light the dried bird's nest slices with fire. If it is a real bird's nest, it will never produce any violent splash sparks.

Authentic bird's nest is irregular and half-moon, about 6.5- 10 cm long and 3-5 cm wide. The side attached to the rock is flat, and the outside is slightly convex. The mucilage condensed layer on the attachment surface is orderly arranged and wavy, and the nest is rough and loofah-like. Hard and brittle, with a slightly horny cross section. It was soft and swollen when entering the water. ?

Extended data:

Nutritional value of bird's nest;

1, types and contents of amino acids

Bird's nest contains a variety of amino acids, such as phenylalanine, valine, leucine, tyrosine and arginine. The content of hydrolyzed amino acids in bird's nest is 42.272%, and the content of essential amino acids accounts for 42% of the total amino acids. At the same time, the contents of delicious amino acids (aspartic acid and glutamic acid) and fragrant amino acids (tyrosine and phenylalanine) are high, indicating that bird's nest tastes delicious.

The nutritional value of food mainly depends on the type, quantity and proportion of amino acids. FAO and WHO put forward the reference pattern spectrum of essential amino acids in food, which stipulated that the mass ratio of essential amino acids to total amino acids and the mass ratio of essential amino acids to non-essential amino acids were 40% and 60% respectively.

2. protein

Protein content in bird's nest is high, but it is closely related to its species. The protein content of Jin Siyan bird's nest is 50.26%.

3. Sialic acid

Sialic acid, also known as bird's nest acid, is the main bioactive component of bird's nest, mainly in the form of N- acetylneuraminic acid. It is reported that the sialic acid content of general bird's nest can reach more than 7%, which is also a means to preliminarily identify true and false bird's nest.

The new blue net-bird's nest is difficult to distinguish between true and false. Let's see how the experts identify it.

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