| http://www.w3.org/ns/prov#value | - n, cobalt, nickel, copper, and aluminum; and metal oxide particulate such as zirconium oxide, silicon oxide, tin oxide, titanium oxide, zinc oxide, aluminum oxide, cerium oxide, magnesium oxide, chrome oxide, manganese oxide (hematite, maghematite, or the like), ferrite, barium titanate, and strontium titanate.
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