Fine salt for stir-frying, because salt for stir-frying is the last step of cooking, so fine salt can be well dissolved with food, while coarse salt particles are large and do not dissolve well. The composition of sodium chloride in fine salt reaches 96%. While the composition of sodium chloride in coarse salt is economically around 86%. But coarse salt contains a lot of trace elements and other ingredients, such as magnesium ions, calcium ions and so on. In terms of usage, coarse salt and fine salt are also used in completely different ways. Fine salt is often used for stir-frying and making soup. And coarse salt will usually be used to pickle vegetables or as other uses.