First of all, the Bird's Nest is made in Jin Siyan. Swallows are rich in saliva and can build nests three times a year. Jin Siyan builds nests to hatch and breed swallows. When swallows learn to fly and forage, old nests are no longer used, and people can take them off. At this time, they were called Mao Yan. Mao Yan, after picking, can be made into finished bird's nest through complex processing such as selecting materials, soaking, removing impurities, plucking hair and drying. Bird's nest is divided into bird's nest, bird's nest, bird's nest, bird's nest, bird's nest cake, bird's nest ball and bird's nest. Zhan Yan, its nutrition, fragrance and hair quality are the best, its color is transparent and yellowish, shiny, and has the smell of bird's nest. Zhan Yan's shape is complete, and its texture is superior to others, such as broken swallows and strips, with dense but not sparse fibers. The foaming rate is high, which can be 3-5 times larger on average, and the top swallow can be 5-8 times larger. The quality of bird's nest foam fundamentally determines the effect of making bird's nest. The foaming rate is the most basic characteristic to measure the quality of bird's nest, so the selection of materials is the most important. For example, the domestic famous brand Fulinmen Bird's Nest often has a foaming rate of more than 8 times, so the bird's nest made in this way has a good taste and effect.

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