| http://www.w3.org/ns/prov#value | - Examples of the materials are chemical compound such as silver nitrate, silver chloride, silver sulfate, silver lactate, silver acetate, silver ions such as silver ammonium complex, silver chloro complex, silver thiosulfato complex, and materials that comprise silver, silver ion, chemical compound containing silver in soluble glass, glaze, zirconium phosphate, calcium phosphate, aluminum phosphate
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