After harvesting the mushrooms, remove the stalks with mud roots and immediately immerse them in clean water or 0.6% salt water. Mechanical injury shall be strictly prevented during picking and transportation; If it cannot be quickly transported back to the factory for processing within 3h after harvest, it must be soaked with 0.6% brine; Or use 0.03% sodium pyrosulfite solution to wash, soak and transport to prevent mushrooms from emerging. If the mushroom is soaked in 0.1% sodium pyrosulfite solution for 5-10 min in the production area, picked up and packed in a film bag, packed in a box, and transported back to the factory, it can be put into production only after 30 min of rinsing.

The whole mushroom is light yellow, the sliced and fragmented mushrooms are light yellow or light grayish yellow, and the soup is clear. The thickness in the same tank is uniform, and a small amount of irregular chip box is allowed; Pieces of mushroom are irregular pieces or pieces.