Snow Bird's Nest doesn't draw silk not because of expiration date, but because it is not authentic. The soaking rate and drawing are the most important factors affecting the quality and price of snow swiftlets. The higher the soaking rate and the better the drawing effect, the better the quality of snow swiftlets and the higher the price.

Snow Bird's Nest can still be eaten after the expiration date. After being collected, snow swiftlets will be air-dried, which can make them very dry and hard. The drying process is usually labeled with a shelf life of 1 year. However, in fact, the better quality of dried snow martins can usually be preserved for 1~3 years if they are properly stored in a cool, dry, airtight and pollution-free environment. Therefore, if the bird's nest has not deteriorated, even if it has been stored for more than one year, it can still be consumed.

The shelf life of the plant swiftlet is between 1~2 years. How long it lasts is related to the quality of the bird's nest, the method of preservation and the environment in which it is kept. The higher the quality and the drier the bird's nest, the longer it will last.

And sealing and storing in a dry, cool place where rats and cockroaches can't easily crawl, and doing a good job in preventing moisture, pollution, insects, and direct sunlight can also prolong the shelf life of the plant's Snow Bird's Nest. Once the Snow Bird's Nest appears to be moldy, buggy, soft, sticky, and smelly, it means that it has already deteriorated and is not recommended for consumption.