| http://www.w3.org/ns/prov#value | - Most preferably, the metal base comprises at least one metallic cation selected from the group consisting of: Li, Na, K, Cs, Mg, Ca, Ba, Zn, Mn, Cu, Al, and at least one anion, such as hydroxide, alkoxide, acetate, carbonate, bicarbonate, oxide, formate or nitrate.
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