Fresh day lily contains a kind of colchicine, which is poisonous. After being absorbed by gastrointestinal tract, it is oxidized into "colchicine" in the body, which is very toxic. So when eating fresh food, don't eat more every time. Because the toxic components of fresh day lily will be weakened or disappeared at the high temperature of 60 degrees, when eating, you should first blanch the fresh day lily with boiling water, then soak it in clear water for more than 2 hours, take it out and wash it with clear water before frying, so that colchicine is destroyed and it is safe to eat fresh day lily. When consumers eat dry products, it is best to soak them in clear water or warm water for many times before eating to remove residual harmful substances, such as sulfur dioxide.