| http://www.w3.org/ns/prov#value | - The metal salt includes but is not limited to, copper acetate, copper formate, copper bromide, copper sulfate, copper chloride, nickel chloride, nickel sulfate, nickel bromide, ferrous bearing compounds, such as, ferrous sulfate, ferrous chloride, and noble metals such as palladium, platinum, silver, gold and rhodium.
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