Pure salt itself has no shelf life, but edible salt with special nutrition has shelf life, and the shelf life is different. The shelf life of iron-containing salt is mostly 1 year, the shelf life of common iodized salt is about 2 years, the shelf life of refined iodized salt is 5 years, the shelf life of low sodium salt is 3 years, and the shelf life of selenium salt, calcium salt and zinc salt is 8 years.

The state stipulates that salt can be free of shelf life, but it does not mean that there is no shelf life, but the shelf life is long. In order to ensure the taste of salt without shelf life, it is best to eat it within 1 year.

Salt is divided into well salt, sea salt, pool salt and rock salt. Including iron, calcium, zinc, potassium, sodium, iodine and other nutrients. The salt people use is a kind of salt, which refers to the salt rich in sodium, that is, sodium chloride.

Matters needing attention in the preservation of edible salt

1, avoid humidity.

Humidity will agglomerate the salt and affect the taste. It should be stored in a dry and cool place to avoid direct sunlight.

2. Avoid touching food.

In particular, avoid contact with acidic foods, because salt easily absorbs odor and affects the taste. At the same time, salt should not come into contact with chemicals such as bleach and detergent, which will pollute salt.

3. Pay attention to sealing.

Sealing can prevent air from contacting with salt and avoid humidity and pollution. Therefore, the salt should be covered tightly after each use to maintain its purity.

4. Pay attention to the shelf life

Edible salt also has a certain shelf life, and expired salt is not suitable for eating. Therefore, when buying salt, we should pay attention to the production date and shelf life to ensure that the edible salt is fresh and safe.

The above contents refer to Baidu Encyclopedia-Edible Salt.