| http://www.w3.org/ns/prov#value | - A magnetic recording medium as in claim 1, wherein said oxo acid is selected from the group consisting of RSO3 H, RSO3 M, ROSO3 H, ROSO3 M, RSO2 H, RSO2 M, ROSO2 H, ROSO2 M, and RSO3 m wherein R is a hydrocarbon group and M represents Na, K, Li, NH4, Zn.sub.(1/2), Be.sub.(1/2), Mg.sub.(1/2), Ca.sub.(1/2), SR.sub.(1/2), Co.sub.(1/2), or an atomic group such as primary ammonium, secondary ammonium,
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