Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 34962-29-3, Whether you call it Iron (II) Ethylenediammonium Sulfate, Iron (II) Ethylenediammonium Sulfate , Ferrous Ethylenediammonium Sulfate or Oespers Reagent you can be assured the Iron (II) Ethylenediammonium Sulfate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.