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Yttrium, a rare earth metal, has a silver-grey color and metallic luster. It also appears highly crystalline. Yttrium displays chemical properties similar to those of rare earth elements. It dissolves in both mineral acids and alkalis, which are chemical opposites of one another.
Tarnish Removal: In general, cleaning with acidified thiourea is preferred over abrasive cleaning. Thiourea chemically dissolves silver sulfide (tarnish). Tarnish on gilt surfaces should always be removed chemically, since abrasives will wear away the thin layer of gold over time.