Hi people. I am asking this for a friend, and he's not here right now, so I'm doing my best to remember exactly what it was that he was looking for, but I know that he is looking for something which is soluble, and I think he said Metal Ion, which is non-toxic etc, that can be used to make heavier water... I know 'Heavy Water' uses Deuterium (Or whichever Isotope of Hydrogen it is), but I think he is looking for some additive solute to achieve a similar ends.... Anyone have any ideas? How do u make an alternative heavy water?