| http://www.w3.org/ns/prov#value | - Preferred metal salts or salt mixtures are mixtures of alkali metal halides, mixtures of alkali metal carbonates, for example the ternary eutectic of lithium, sodium and potassium carbonate; and the halides of zinc, tin and iron, the latter metal halide having a minor amount of alkali metal halide added thereto as a melting point depressant.
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