1. The products produced by big factories or famous brands should be the first choice.
2. Choose the nearest store with a low-temperature freezer to buy.
3. To choose products with good packaging, clear identification and long effective shelf life.
4. Pay attention to whether the product in the package is of natural color; if there are spots or discoloration, it means that it has deteriorated.
5. Pay attention to whether there is thawing phenomenon, good frozen food should be hard.
6. The quick-frozen food should be taken at the end of each purchase, so as not to leave the freezer for too long. Generally, the outdoor storage time is about 1 hour, and it can be stored for about 4 hours when using a thermal insulation bag. (It depends on the weather and temperature.)
