First, the auricularia auricula has been soaked for a long time, so it will produce toxins and cannot be eaten. Black fungus is soaked in a proper amount. If it is soaked too much, it should be refrigerated in the refrigerator for 24 hours. After more than 24 hours, it should be thrown away regardless of deterioration.

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second, auricularia auricula will breed bacteria after soaking for a long time, which will make auricularia auricula deteriorate and taste bad, and also produce toxins, which will endanger the health of the body. Moreover, auricularia auricula will be softer after soaking for a long time, and its edible taste will be reduced. Such auricularia auricula is not edible.

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1. The colloid in Auricularia auricula can adsorb and concentrate the dust and impurities remaining in the human digestive system, and discharge them out of the body, and act as a scavenger of the stomach. It also has a significant dissolving function for 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. After eating fresh fungus, plant solar dermatitis will occur, which will cause itching, redness and itching of the skin. Therefore, fungus needs sun exposure, decompose porphyrin, and make it into dry products before selling it.

3. The dried auricularia auricula needs to be soaked and washed before eating. Soak it in warm water as much as possible to shorten the soaking time. After soaking, wash it with running water for two or three times to remove impurities and toxic substances to the maximum extent.