Because the surface will produce some white substances, usually caused by substances such as salt and oil.

In the process of air-drying food (especially animal food), some fatty substances exude, which will be evenly distributed on the surface of dried meat with long-term wind blowing. It is worth noting that it depends on whether this Mao Mao is a sign of mildew. If it is mildew, don't eat it.

Dried beef is generally dried meat marinated with beef and other seasonings. Beef is the second largest meat food in China, second only to pork. Beef has high protein content and low fat content, and contains many minerals and amino acids needed by human body, which will not deteriorate after a long time.