1. "Salt" is our common table salt.

2. The original meaning of the word "salt" is "to cook brine in a vessel." "Shuowen" records: Those who are born are called brine, and those who are cooked are called salt. Legend has it that during the time of the Yellow Emperor, there was a prince named Susha who boiled sea water and fried it into salt. The colors were green, yellow, white, black and purple. The Chinese began to cook salt around the time of Shennong (Yan Emperor) and Huang Emperor. Salt in ancient China was boiled from sea water.

3. Industrially, seawater is used to dry salt (also called salt field method) or well water or salt lake water is used to boil salt to precipitate salt crystals. The table salt produced in this way contains more impurities and is called coarse salt. Refined salt can be obtained from coarse salt through dissolution, precipitation, filtration and evaporation. In order to eliminate the hazards of iodine deficiency and protect the health of citizens, the state has adopted comprehensive prevention and control measures focusing on the long-term supply of iodized salt (hereinafter referred to as iodized salt).