1. If the mushroom cap turns black, it can be eaten. If there are a few black spots on the mushroom cap, and the bacteria are elastic and have no peculiar smell, the mushroom can still be eaten, but the nutritional value will be reduced.

2. If the gills turn black, you can eat them. During storage, the mushrooms will gradually age, opening of the umbrellas, and shedding of the bacterial film. The blackening of mushroom gills is due to the long storage time and the mature spores in the gills. Such mushrooms can be eaten, but the taste and nutritional value will be reduced.

3. If the inside of the mushroom becomes black, it cannot be eaten. If the inside of the mushroom appears, the stem becomes black, the elasticity of the mushroom becomes poor or sticky or even has a sour smell, it means it has been spoiled. Such mushrooms cannot be eaten. Food. Not only does it have no nutritional value, it also poses a safety hazard.