Precautions for choosing bird's nest?
The real bird's nest smells like a faint egg white. If the bird's nest has a higher humidity, the egg white smell will be stronger. If it is bleached bird's nest or painted bird's nest, there is basically no egg white smell, and bleached bird's nest even has a strong chemical medicine smell. ?
The grain of real bird's nest is different in thickness, clear and natural, with thin and dense swallows and irregular seams in the lamp body. The fake bird's nest made of resin, pigskin, etc. looks unnatural. The thickness of the swallows is very close, and there is basically no gap in the middle of the lamp body. The glue-brushed bird's nest also looks like a thick layer of skin on the surface of the bird's nest.
Extended data:
1, seaweed bird's nest
It is more common in swallow cakes or shredded swallows, and it is filled with cheap seaweed shreds, which is a mixture of true and false. Identification method: natural bird's nest strips are transparent and slightly yellow in color, shiny and odorless. The seaweed bird's nest is white in color, less shiny, thick and hard, and has seaweed flavor.
2. Aqueous bird's nest
In order to maintain the integrity of normal bird's nest in the market circulation, its water content is higher than other Chinese herbal medicines, generally between12% and15%. But in order to increase the weight, there are many bird's nests with high moisture content in the market, which are extremely cheap.
Identification method: Generally, each bird's nest is only about 6~ 7g (excluding extra-large and extra-thick species). If it is larger than this, high moisture content should be considered. In addition, the bird's nest can also be placed in a vacuum drying oven, and the water content can be calculated by weighing after drying. If the water content is more than 15%, it is a water-containing bird's nest. ?
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