| http://www.w3.org/ns/prov#value | - Examples of suitable reactive powders are described in the Prosser et at. article cited above, the disclosure of which is hereby incorporated by reference, as well as metal oxides such as zinc oxide and magnesium oxide, and ion-leachable glasses, e.g., as described in U.S. Pat. Nos. 3,655,605, 3,814,717, 4,143,018, 4,209,434, 4,360,605 and 4,376,835.
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