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Originally Posted by HarryT
But - please correct me if I'm wrong - wasn't the radium used to paint the numbers on the dial and the hands of the watch? It wasn't used as a transparent coating on "top" of something else.
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Yes. That's where the "probably not suitable for this application" part kicks in. Perhaps you could combine the radium with the e-ink dye itself rather than over-top of it.
Quote:
Originally Posted by HarryT
Your idea is an interesting one, ...
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Not so much really. It was written in jest. The EPA would have a conniption were someone to actually try to produce this on a commercial scale. Tritium is another possibility but the half-life is too short.