prov:value
| - a copper salt of an organic carboxylic acid having 2 to 15 carbon atoms such as copper acetate, copper naphthenate, copper octanoate and the like, and a copper salt such as copper chloride, copper bromide, copper nitrate, copper sulfate, copper methanesulfonte, copper trifluoromethanesulfonate, copper cyanate, copper carbonate and copper oxide, and a mixture thereof.
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