Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 28300-74-5, Whether you call it Antimony Potassium Tartrate, Trihydrate, Potassium Antimonyl Tartrate or Tartar Emetic you can be assured the Antimony Potassium Tartrate, Trihydrate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.