They glowed in the dark.
In 1917, the U.S. Radium Corporation began hiring women and girls as young as 14 to paint the dials on their watches. They used a special radium paint called Undark. The corporation sold the watches to the U.S. military for a huge profit. The girls made 1.5 cents per dial. It was good money back then. Plus, glowing in the dark made these patriotic young women popular.
They became known as the ghost girls.
As you can imagine, working with radium is dangerous. This wasn't a case of naivety. Scientists already knew the danger of radium. Chemists at the U.S. Radium Corporation wore protective gear when handling the stuff. And yet, the ghost girls were told it was completely safe.
Not only were the ghost girls told not to worry, but the Radium Corporation deliberately deprived them of the rags and rinse solution they needed to clean their brushes. They thought it was too expensive. Instead, managers told them to wet their brushes by licking them between dials.
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