Really! Xizhiyuan Bird's Nest Emperor Yi Deng Yard: refers to the traceability label affixed to each bird's nest by China Academy of Inspection and Quarantine after the bird's nest has passed the inspection. Since 20 15, in order to standardize the bird's nest market, the state requires that every bird's nest that meets China's food safety standards and is exported to China should be labeled with traceability. Of all the bird's nests exported from the country of origin, only a few can fully meet the safety standards and are allowed to affix traceability labels. Bird's nest that is not up to standard is not allowed to be traced because the contents of nitrite, mold and heavy metals exceed the standard. Selected Bai Yan SS, determined by local environment and weather, bird's nest contains less impurities and high nutrients. The swallow silk is clearly visible. Select light and thin wool raw materials, and pick wool by hand without bacteria. Swallow silk can be seen, without glue.