Radium of radium Curie used the residues after extraction of uranium from pitchblende. The uranium had been extracted by dissolution in sulfuric acid leaving radium sulfate, which is similar to barium sulfate but even less soluble in the residues. The residues also contained rather substantial amounts of barium sulfate which thus acted as a carrier for the radium sulfate. The first steps of the radium extraction process involved boiling with sodium hydroxide followed by hydrochloric acid treatment to remove as much as possible of other compounds. The remaining residue was then treated with sodium carbonate to convert the barium sulfate into
Radium Girls to release their data. At the urging of the companies, worker deaths were attributed by medical professionals to other causes. Syphilis, a notorious sexually transmitted infection at the time, was often cited in attempts to smear the reputations of the women. The inventor of radium dial paint, Dr. Sabin A. Von Sochocky, died in November 1928, becoming the 16th known victim of poisoning by radium dial paint. He had gotten sick from radium in his hands, not the jaw, but the circumstances of his death helped the Radium Girls in court. The Radium Dial Company was established in Ottawa, Illinois,