1, edible salt is relatively pure sodium chloride, and industrial salt not only contains sodium chloride, but also contains high content of sodium nitrite.

2. Salt is neutral after melting, and industrial salt is alkaline after melting.

3. Salt is relatively stable and will not change at will. Industrial salt is relatively stable when it is dried, but it will gradually absorb oxygen in the air and eventually become nitric acid.

4. Industrial salts are sulfates and nitrates, which are harmful. Eating edible salt is harmless to your health.