| http://www.w3.org/ns/prov#value | - The aromatic sulfonic acids which may be used, according to this invention, are derived from aromatic hydrocarbons such as benzene, naphthalene, anthracene, acenaphthene, phenanthrene, retene (7-isopropyl-l-methyl-phenanthrene), fluorene, etc., and may containone or more sulfonic acid radicals, usually not more than three, to induce solubility in the electrolyte.
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