First, auricularia auricula is soaked for a long time, which will produce toxins and cannot be eaten. Soak black fungus in proper amount. If it is soaked too much, it should be put in the refrigerator for 24 hours. If it exceeds 24 hours, throw it away regardless of deterioration.

Second, soaking auricularia auricula for a long time will breed bacteria, make auricularia auricula deteriorate, taste bad, and produce toxins, which will endanger health. Moreover, black fungus will be softer after soaking for a long time, and the edible taste will be reduced. Such fungus is inedible.

1. The colloid in Auricularia auricula can adsorb and concentrate the dust and impurities left in the human digestive system and excrete them, playing the role of scavenger of the stomach. It can also dissolve endogenous foreign bodies such as gallstones and kidney calculi.

2. Fresh auricularia is inedible. This is because fresh fungus contains a kind of "porphyrin" substance. Plant solar dermatitis will occur after eating fresh auricularia auricula, causing itching, redness and itching of the skin. Therefore, auricularia auricula needs to be exposed to the sun, decompose porphyrin, and make it into dry products before selling.

3. Dry fungus needs to be soaked and washed before eating. Soak in warm water as much as possible to shorten the soaking time. Rinse with running water for two or three times after soaking to remove impurities and toxic substances to the maximum extent.