| http://www.w3.org/ns/prov#value | - The promoter may be compounds such as boric acids, ammonium chromate, chromic oxide, selenic acid, ammonium chloride, ferric chloride, potassium vanadate, vanadic acid, lead monoxide or dioxide, zinc oxide, arsenous or arsenic oxide, antomony oxide, molybdic oxide, phosphomolybdic acid, molybdic oxide, ammonium molybdate and similar compounds.
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