High Quality Content by WIKIPEDIA articles! Radium dials are radioluminescent watch, clock and other instrument dials. In the early 1900s glow-in-the-dark clock and watch faces had the digits painted using paint containing radium, the most common version created by the United States Radium Corporation was called Undark. Radium dials were almost always painted by young women, who used to 'point' their brushes by licking and shaping the bristles prior to painting the fine lines and numbers on the dials. This practice resulted in the ingestion of radium, which caused serious jaw-bone degeneration and malignancy and other dental diseases reminiscent of phossy jaw. The disease, radium-induced osteonecrosis, was recognized as an occupational disease in 1925, and the affected workers came to be known as the Radium Girls. By 1930 all dial painters stopped pointing their brushes by mouth. Stopping this practice drastically reduced the amount of radium ingested and therefore, the incidence of malignancy, to zero by 1950.

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