| prov:value
| - ch as triphenylphosphine, triphenyl phosphite, hypophosphorous acid or triethyl phosphate, sulfur compounds such as diphenyl sulfide, phenothiazine or metal salts, for example copper chloride, copper dithiocarbamate, copper sulfate, copper salicylate, copper acetate, manganese chloride, manganese dithiocarbamate, manganese sulfate, manganese salicylate, manganese acetate, cerium chloride, cerium d
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