Crabmeat mushrooms without blanching is easy to be poisoned. Crab mushrooms contain nitrite, not blanched easy to poison. Crab mushrooms contain nitrites, not blanched easy to be poisoned. Nitrite will react with stomach acid to produce nitrosamines, which are harmful to the human body. Before cooking, you must blanch the crab meat mushrooms to remove the nitrites and avoid poisoning. Crab mushrooms belong to mushrooms, mushrooms are easily contaminated with bacteria, and mold and other conditions, not blanching, if the bacteria inside will enter the human body, so that people have signs of poisoning, crab mushrooms blanching can remove the surface of the crab mushrooms of the poisonous residues, so that eat more healthy. Crab mushrooms, belonging to the subphylum of tanya mushrooms, white mushrooms, a good edible fungus in the north temperate zone. Its fruiting bodies are grouped or clustered. The surface of the cap is nearly white to gray-brown, and there is often a dark marble pattern in the center. The gills are nearly white, curved with the stipe, dense to slightly sparse. Crab mushroom lateral growth when the stipe biased, spore prints nearly white, broadly ovoid to subglobose.