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Patent Granted Disclosed is a salt core (2) composed of potassium and sodium as cations and chlorine and carbonic acid as anions. In the salt core (2), the molar ratio of the potassium ions in the total cations, namely XK<+> (= [K<+>]/([Na<+>] + [K<+>]) x 100) is set at 60-70 mol%, and the molar ratio of the carbonic acid ions in the total anions, namely YCO3 <2->