prov:value
| - Metal sols are disclosed in Leuvering, U.S. Pat. No. 4,313,734, issued Feb. 2, 1982 and Moeremans, et al., U.S. Pat. No. 4,775,636, issued Oct. 4, 1988, each of which is hereby incorporated by reference in its entirety, and comprise a metal, a metal compound, such as metal oxides, metal hydroxides and metal salts, or polymer nuclei coated with a metal or metal compound.
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