| http://www.w3.org/ns/prov#value | - on which is a reaction product of (a) an organometallic reducing compound corresponding to the formula MR X, where M is a Group 1a, 2a or 3a metal, R is hydrogen or an alkyl group having from one to eight carbon atoms, X is. halogen, n m is a positive whole number corresponding to the number of valence electrons of M, n is l, 2 or 3 and m is 0, 1 or 2 with (2) a reducible zirconium compound to yie
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