From 1917 to 1926, U.S. Radium Corporation, originally called the Radium Luminous Material Corporation, was engaged in the extraction and purification of radium from carnotite ore to produce luminous paints, which were marketed under the brand name "Undark".
Many of the women later began to suffer from anemia, bone fractures and necrosis of the jaw, a condition now known as radium jaw.