Salt can be divided into rock salt, sea salt and edible salt.
1.Rock salt just as its name implies that it comes from rock such as rock salt in desert, well salt in Sichuan and the rock salt under ground hundreds of meters. Rock salt is suitable for sensitive skin since it contains ample mineral.
2.Sea salt also contains abundant mineral so it is always used to make bath salt which can not only eliminate horn but also speed blood circulation.
3.As to edible salt, it is the most stable acid-alkali value. Besides, it has the effect of disinfection.
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