| http://www.w3.org/ns/prov#value | - Substances of that type which are preferably used are inorganic salts, such as alkali metal, magnesium and ammonium chlorides and sulphates, for example magnesium sulphate, potassium sulphate, sodium sulphate, potassium chloride, ammonium sulphate, lithium sulphate and ammomium chloride, furthermore oxides, such as magnesium oxide, nitrates, carbonates, hydrogen carbonates, silicates, talc, chalk,
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