| http://www.w3.org/ns/prov#value | - (NH.sub.4).sub.2NaFeF.sub.6, ammonium and potassium salts, such as (NH.sub.4)K.sub.2FeF.sub.6 and (NH.sub.4).sub.2KFeF.sub.6, sodium and potassium salts, such as K.sub.2NaFeF.sub.6 and KNa.sub.2FeF.sub.6, calcium and sodium salts, such as CaNaFeF.sub.6,
|
