As it is #ChocolateDay how about some radium chocolates? Burkbraun were a German company who launched radium schokolade for 'drinking and eating' in Britain in 1931.

Or how about Harper's radium chocolates with the tasty tagline: 'They Glow in the Dark.' I have not been able to find out anything about these and tempted to say this is a fake. But Burkbraun radium chocolate definitely existed and was heavily advertised.