Fine salt, often referred to as refined salt, is salt that has been processed to remove impurities. In some places, iodine is added to the thin salt to prevent thyroid disease caused by insufficient iodine intake. The appearance of fine salt is smaller and finer.

Coarse salt is sometimes called sea salt. It is obtained by evaporating sea water or saltwater lake water. It is less processed and a small amount of minerals will remain, making the color and taste of coarse salt slightly different. It's rough going up.

The main chemical component of table salt is sodium chloride. Usually coarse salt contains 85% to 90% sodium chloride, and fine salt contains more than 96%. However, in addition to sodium chloride, coarse salt also contains water, magnesium chloride, magnesium sulfate, potassium chloride, calcium sulfate, iodine and other trace compounds. These compounds are essential substances for the human body and exist in certain amounts in coarse salt, but in Fine salt is removed during processing.