It is suggested that you can buy crude salt in some large supermarkets. If you can't buy it offline, you can also buy crude salt on major online e-commerce platforms. Large-grain salt begins with the saturated brine entering the salt pond to dry the salt, allowing it to crystallize naturally, and then until the sodium chloride in the saturated brine entering the pond is completely precipitated, and the mother brine is drained, and then the saturated brine is added to promote crystallization. After repeated several times, it will take more than three or four months to finally form coarse salt with large particle size.
Refined salt is the salt after deep processing, and impurities need to be removed, so the particles of salt are relatively small. Edible salt is made from live brine by vacuum evaporation process, mechanical thermal compression evaporation process and crushing, washing and drying process.
Composition of large grain salt
Large-grain salt is what we often call coarse salt. Because the processing method of coarse salt is not fine, the content of sodium chloride is lower than that of refined salt. Generally, the sodium chloride content of crude salt is about 85%-90%, so cooking with the same quality of crude salt and refined salt is more salty, because the sodium chloride content of refined salt is generally above 96%.
From here, we can know that the refined salt is basically sodium chloride, and other nutrients and impurities are less. Although the content of sodium chloride in crude salt is lower than that in refined salt, the content of other nutrients is higher than that in refined salt.