Direct from the big bang - Deuterium

[Moonliner]

Excellent thoughts, thanks!

I'm trying to come up with something that shows it's not just water. Deuterium does give off a red glow that looks way cool if you put it in a fusion reactor but I foresee complications with TSA if I try to travel with an unlicensed fusion reactor around my neck.

It is slightly heaver than water so perhaps incorporating some type of a balance scale concept would work.

Think, think think....