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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.
A hundred (100) g of the polystyrene foam was able to be dissolved in 100 g of dipropylene glycol dimethyl ether. In this manner, the solvent in accordance with the present invention can dissolve a large quantity of the polystyrene foam.