Black spot of sufu bottle cap

There may be several reasons for the black spots on the sufu bottle cap:

1. Fungal growth: If there are black spots on the bottle cap of sufu, it may be caused by fungal growth. Fungus is a kind of microorganism, which usually breeds in a humid environment. If the sufu bottle cap is not well sealed or stored in a humid environment, fungi may breed inside the bottle cap and produce black spots.

2. Oxidation: There are some components in sufu that are sensitive to oxidation. If the cap of sufu is not completely sealed or exposed to air for a long time, the components in sufu may react with oxygen, leading to oxidation. This oxidation reaction may also lead to black spots inside the bottle cap.

3. Foreign body pollution: In the production process, if foreign bodies such as dust and impurities enter the inside of the sufu bottle cap, it may also lead to the appearance of black spots.

If there are black spots on the bottle cap of sufu, it is recommended not to eat it. You can contact the manufacturer or seller of sufu for consultation, understand the specific situation and seek solutions. Remember to pay attention to hygiene and safety during food storage and use to ensure the freshness and quality of food.