The reason is that the soaking time is too long, which leads to the production of harmful substances by auricularia auricula. If you want to avoid poisoning, you should soak the fungus in the right way. The soaking time should not be too long, and you should change more water during the soaking process.

Improper soaking method of auricularia auricula will breed a kind of pseudomonas cocoanum, which is nontoxic, but it will produce a kind of toxic mycotic acid in the process of soaking auricularia auricula. This substance is particularly toxic, which will lead to poisoning, nausea, vomiting and diarrhea after being absorbed by human body.

Black fungus didn't change water in the middle of soaking, and the environmental temperature was not well controlled, which led to the important cause of fungus poisoning, because it would breed a kind of bacteria harmful to human body during soaking, and this kind of bacteria would breed fastest when the external temperature was around 37 degrees, so if you want to avoid fungus poisoning, you should put it in a low temperature place to soak it. If you soak black fungus in summer, you'd better put it in the refrigerator to soak it, so as to avoid its own harmful substances to human body.

Change the water for 2~3 times in the soaking process of auricularia auricula, so as to avoid the turbid, sticky and peculiar smell of the water soaked in auricularia auricula. If this happens, don't continue to eat auricularia auricula, otherwise it will affect its food safety. In addition, the soaking time of auricularia auricula should not be too long. Under normal circumstances, it can be soaked in two or three hours, because its deterioration speed is particularly fast. When the soaking time exceeds 8 hours, it will breed a large number of bacteria, and such auricularia auricula will be poisoned after eating.

After soaking auricularia auricula, it should be eaten as soon as possible, and it should not be stored for a long time. Besides, don't soak auricularia auricula too much every time, otherwise it will not be finished, which will cause harmful substances during storage, and continue to eat it will also lead to food poisoning, which will endanger human health. After soaking, the auricularia auricula should be carefully cleaned, and the edible auricularia auricula with deterioration or odor should be stopped, so as to avoid poisoning symptoms.