Why don't Beijing Daoxiang Village cakes stay in Datong Store for one year?

There are antiseptic ingredients. Daoxiang Village is at the exit of the supermarket. Many people buy it. It is a fast-selling product, and there is no hoarding in the store. Because it is a ready-to-eat product in bulk, people who buy it home are easily hinted to open the package to eat, so there is no long-term accumulation at home. In addition, the products sold outside contain some antiseptic ingredients more or less, which is of course within the safety range.