Why some watches glow in dark?
Why we can see the time in some watches even in the dark?
The numbers are coated with a luminous material. It use to be slightly radioactive, but I think a substitute was found years ago. The numbers were painted at one time with a radioactive material, which would normally cause no harm. Except the numbers were painted by hands and some of the painters were licking their brushes to keep the bristles from spreading. This was back in the 1950s. I was involved in a project involving naturally occurring radioactive material. I am sure the process is now automated.
Larry Walls, Can you think about such radioactive material which would normally cause no harm? Can we compare the cost of radioactive material with that of a watch?
Of course it causes harm, that is what it is not done any longer. Shoe stores had machines to X-ray your foot inside your shoe--bad idea. You ask a question. I was not promoting or approving. It is part of history.
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