| http://www.w3.org/ns/prov#value | - ns, yet sulphate ions irom other ingredients or reagents such as ammonium sulphate and sulphuric acid, may likewise react withcalcium and/ormagnesium salts to form sulphates,-especially when ferrous salts other than copperas are used to react with the ferrous alkali ierrocyanide. i This application is .acontinuation in part of my pending application, Serial No. 669,560,1iled May. 5, 1933, as tocom
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