A good bird's nest should be dry to the touch. Wet bird's nest contains more water, and it will be moldy if it is stored improperly. Pay attention to the loss rate and the price increase on the package. You should buy from a reputable local store and read the quality assurance clearly. Nest factory bird's nest is clean and full, delicate and smooth, and full of fragrance. Please master the following points for non-laboratory identification of bird's nest: 1. Bird's nest should be a filiform structure, not a real bird's nest composed of fragments; 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. Those with special smell, fishy smell or greasy smell are fakes; 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. How to identify the advantages and disadvantages of bird's nest? The difference between bird's nest and its quality lies in six indicators: origin, origin, completeness, cleanliness, taste and moisture content. 1. There are three places of domestic bird's nest: Yanyan in Huaiji County, Zhaoqing City, Guangdong Province, Yanzidong in Jianshui County, Honghe Prefecture, Yunnan Province, and Dazhou Island, Hainan Province (only two bird's nests were collected in 2002, and only 15 Jin Siyan was left in September 2006, which has been protected for a long time). Due to its proximity to the Tropic of Cancer, the collection of bird's nest is seasonal and the output is scarce, with the total amount less than one tenth of the global output of bird's nest. A large number of people in Southeast Asia go to caves to collect bird's nest, which is not only extremely dangerous, but also plunders nature after they collect caves. On the cliffs of several small islands in Thailand, many rotten bamboo ladders lead to caves once rich in bird's nest. Now these caves are abandoned, and Yaner is gone. With the increasing calls for protecting nature, the Yanwu invented by China people came into being. The structure of these swallow houses is no different from that of ordinary houses, but raising swallows is not raising birds. Swallows are still wild and feed on their own. The house is only used to attract swallows to live together, so that swallows can nest in the house and collect a large number of bird's nests. The bird's nest in the swallow house with environmental awareness will not be picked until 18-24 days when the swallows hatch and fly in 45 days. Jin Siyan went back to the house and built a new nest, which was handed down from generation to generation. Environmental protection swallow is cleaner, smoother, whiter and more delicate than cave swallow in harsh environment. Second, the hair head "hair head" is calculated by weight. The greater the weight difference between the soaked bird's nest and the dried bird's nest, the better the "hair head". Generally, high-quality bird's nest has 6 to 8 times the "hairy head". The origin, location, picking season, processing technology, dry humidity, soaking season, room temperature and water temperature, and even the difference between morning and evening, hair will be different. However, some netizens sent the "bird's nest" bought in a bird's nest monopoly from Guangzhou. When they opened the envelope, they smelled a pungent chemical smell. I took a small piece, which expanded hundreds of times and was solid and granular. It was really terrible. Third, integrity is to remove the hair and clean up the picked bird's nest. It is not easy to keep the bird's nest clean and intact. In Emerald Jade, Liang Yiqing spent three years trying to carve the treasure ship that Zheng He brought back to the Bird's Nest, and finally failed. Swallow washing workers of high-quality brands of bird's nest are equally conscientious and dare not slack off. A good face-washing master is often trained from an early age, not only to master exquisite finger magic, but also to pay attention to "eye-to-eye, hand-to-hand, heart-to-heart" like a gem sculptor. Only the first-born swallows are selected for high-quality super swallows, which are complete and full, dense in texture and crystal clear in color. It is the ultimate enjoyment of high-quality living art. The cleanest, most complete and best-quality bird's nest must be the most attentive bird's nest. Fourth, clean and high-quality bird's nest should not contain impurities such as eggshells and beetles. Natural bird's nest will have a little fluff, which can be soaked in clear water to skim off impurities. Some vendors washed it with medicine and stirred it with a stick, and the swallow hair immediately floated to the surface, but no one dared to eat such bird's nest. Fifth, high-quality bird's nest tastes delicate and smooth. If the water for stewing bird's nest is sticky, it will often be coated with glue or thickened. Different grades of bird's nest have different tastes: the special swallow cup Q is smooth and tender, which is extremely enjoyable. Bird's nest net is the "Yan 'an" part in the middle of bird's nest, and it is a slender net that supports eggs and Xiaoyan. The taste is delicate and easy to digest and absorb. Yanjiao is the part used by Jin Siyan to fix the two ends of bird's nest. It is the "load-bearing beam" of the Bird's Nest. Thick, refreshing and chewy, and the stew takes a long time. It is the concentrated part of bird's nest nutrition. 6. There are many bird's nests with high water content in the market. This kind of bird's nest is extremely cheap, but it is a mixed bag. The highest water content of true bird's nest can reach 40-60%. Even if it is stored in a wooden box or moistureproof box, it will still go bad, just like the so-called "golden jade is outside, but it is ruined" in The Word of Orange Water. High-quality bird's nest will not be moldy even if it is not put in a wooden box. Buying high-quality international brand bird's nest from famous shops is the best shortcut to prevent bird's nest from becoming moldy. 7. What is a good instant bird's nest? Top grade instant bird's nest is crystal clear. After the ready-to-eat bird's nest bottle is tilted at 45 degrees, there is not much water, and the bird's nest is crystal clear and delicate. High-quality ready-to-eat bird's nest (Bai Yan) has unique bird's nest collagen, which is rich in flavor after opening a bottle. Because Jin Siyan eats algae and insects on the seashore, the taste of stewed blood swallow is not as rich as that of Bai Yan, but the mineral content is high. The instant bird's nest stewed by exquisite craftsmanship has a smooth and elastic taste. Natural ready-to-eat bird's nest should be marked without preservatives and additives.