OK. I'm ready to cast my vote, and none of 'em sound right to me, so I'm going to give my vote to n because it gave me the biggest laugh and burst of delight. This in no way means that I think it's correct. They all sound off-mark.

Leftovers was tempting for simplicity as was (related) the oxidized residue, which would be a kind of metallic leftover. And isn't there a baronium or something like that? Must get back in touch with the metallurgist inside of me, that is if metallurgist is a word.

But: A big vote for n 'cuz it's comical, although my daughter thinks it's stupid.

Best regards,
WW with a lithium rating of 142+