| http://www.w3.org/ns/prov#value | - In general, these processes involve dissolving or suspending the metal oxide or metal salt (for example, nitrate, chloride or sulfate) of an element with an atomic number of 21 to 29, 42, 44 or 57 to 83 (for example, oxides or salts of Mn+2, Cr+3, Fe+2, Fe+3, Co+3, Ni+2, Cu+2, Pr+3, Nd+3, Sm+3, Yb+3, Gd+3, Tb+3, Dy+3, Ho+3, or Er+3) in water or a lower alcohol such as methanol, ethanol or isopropa
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