But in fact, the dry snow swallow with good quality can be properly preserved in a cool, dry, sealed and pollution-free environment, usually for 1-3 years.
Xueyan stew is sour, which may be caused by the deterioration of Xueyan or the addition of other foods when stewing soup. Xueyan is rich in sugar. If the soup is stewed with Xueyan alone and tastes sour, then Xueyan has gone bad and is not recommended to eat. If you add red dates when stewing Xueyan, it will be a little sour and bitter after stewing for a long time.