Colour of the day no 21 - Undark UndarkUndark was a trade name for luminous paint made from radioactive radium and zinc sulfide, produced by the U.S. Radium Corporation between 1917 and 1938. It was used primarily in watch dials. The people working in the industry who applied the radioactive paint became known as Radium Girls, because many of them became ill and some died from exposure to the radiation emitted by the paint. Undark was also available as a kit for general consumer use and marketed as glow-in-the-dark paint. (text: web source)

Colour of the day no 21 - Undark

Undark
Undark was a trade name for luminous paint made from radioactive radium and zinc sulfide, produced by the U.S. Radium Corporation between 1917 and 1938. It was used primarily in watch dials. The people working in the industry who applied the radioactive paint became known as Radium Girls, because many of them became ill and some died from exposure to the radiation emitted by the paint. Undark was also available as a kit for general consumer use and marketed as glow-in-the-dark paint.

(text: web source)

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