Sulfonic acid surfactants useful in this invention are selected from the compounds having the general formula R4 C6 H4 SO3 H and the general formula R5 O(C2 H4 O)m SO3 H wherein R4 is an aliphatic monovalent hydrocarbon group having at least 6 carbon atoms, R5 is an aliphatic monovalent hydrocarbon group having at least 6 carbon atoms or an aryl group substituted by an aliphatic monovalent hydroca