| http://www.w3.org/ns/prov#value | - Suitable metal salts of a strong acid particularly include the nitrates, sulfates and halides, and especially the nitrates, for example, aluminum nitrate, ferric nitrate, nickel nitrate, cobalt nitrate, chromium nitrate, copper nitrate, palladium nitrate, silver nitrate, zinc nitrate, stannous and stannic nitrate and the like.
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