Chromium: Luck is another tricky thing to store. During active storage, does everything that can go wrong, go wrong? When tapping, does everything that can go well, go well? Is it that black and white, or is it greyer than that? I'm not really sure. Regardless, I'd only fill a chromiummind at home. Absolutely no filling in public, or around other people, ever. EVER!
I don't actually think this is "right." In the RPG book it does say "Whatever can go wrong will go wrong." But then it goes further and says that it cuts you off from fate and the designs of the cosmos. So, rather than having bad luck, I would think that you have -no luck.-
Luck is a funny thing, of course. Some have more than others, whilst some have little to begin with. Does that mean an exceptionally lucky person could store more, safely? (If you go with the "Bad Luck" side of things.)
And if you go with the no-luck concept, then it wouldn't be all that dangerous, you simply would not be where Harmony means for you to be. Unguided by whatever force that leads you around. *Shrug* Just some notions.