1, bird's nest cups are distinguished by "dense, sparse and sparse", which are classified into top bird's nest cups and sparse ones. Generally, cup-shaped complete fibers are closely classified as Grade I, while cup-shaped incomplete fibers are not closely classified as Grade II.

2. According to the division of cup type, a complete cup type is better.

3. According to the color contrast of bird's nest, bird's nest can be divided into Bai Yan and blood swallow. Comparing the quality and price of bird's nest is actually controversial. A large number of data show that Bai Yan has the highest content of unique components in the first phase of bird's nest, and the difference between them is not very big. However, because the production of blood swallow is very rare, and it has a special texture and taste, sometimes the market price is slightly higher than that of Bai Yan.

Seasonal classification:

The harvest season of bird's nest is generally from February to 10 every year.

The bird's nest harvested in February-April is suitable for insect reproduction because of abundant rain, while Jin Siyan has plenty of food and much saliva secretion, so the bird's nest cup is complete, shiny and hairless, so we often call it the "first swallow".

The bird's nest collected from May to 65438+ 10 is called "Phase II Swallow" and "Phase III Swallow", which is the molting period in Jin Siyan, so the nest is loose, its lamp shape is not as good as that of Phase I, and there are many impurities in the fluff.