Radioactivity–it used to be a selling point. Here’s a gallery of glowing goodness (in French, but a lot of the images speak for themselves).
Neatorama likes the Radium chocolate bar. I like the Radium Emanation Bath (pictured), plus a nice jug of “Pure-Radium-Water… Remedy for Rheumatism – Eczema – Stomach Troubles.” That’s right, radium–the proto-Pepto! Of course, it probably tasted better than Pepto. But whatever.
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You would be the bomb at the next Rave, (Do they do raves anymore?) if you brush your teeth with radium.
I remember, watching a documentary on Radial Dial which used radium on the numbers of their clocks. Women would literally brish this stuff on their teeth so they would glow. They unfortunately got bone cancer.
Actually they would lick their brushes to get a finer brush tip when painting the clock hands, and then they got radiation poisoning.