| http://www.w3.org/ns/prov#value | - --COONa, --COOK, --COO.sup.- NR.sup.+.sub.4, --SO.sub.3 Na, --HPO.sub.3 Na, --SO3.sup.- NR.sup.+.sub.4 and --PO.sub.3 Na.sub.2, where R is an alkyl or phenyl group. Particularly preferred ionizable substituents are --COOH and --SO.sub.3 H and their
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