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特許 権利維持 Disclosed is a salt core (2) which is formed into a shape of a water jacket (6) by die-casting or the like by using a salt of bromine and at least one of sodium and potassium and a salt of carbonic acid and at least one of sodium and potassium. The salt core (2) contains at least one of potassium and sodium as a cation, and bromine and carbonic acid as anions.