We've been led to believe since the very beginning that feruchemy is completely end-neutral, meaning that you always get out the same power that you put in. (Excluding compounding)
Something that I noticed while rereading the Mistborn era one books, however, seems to not match the pattern!
Atium! Atium is not end neutral! The trait that it stores is age, which means that as soon as you store it, you've lost the time that you spent being old to store it in the first place!
Let me explain better: if you were to store age in an Atium metalmind, even only for a few seconds, then use it to become equally younger for the same amount of time, you would be OLDER by a few seconds at the end, then when you started!
Someone needs to ask Brandon if this is a quirk of storing an atribute that naturally decays over time (people age constantly), or if the feruchemical use of Atium is end-negative on purpose, because it is of Ruins power.
If it isn't just a quirk, or I'm not a crazy person, this could mean that lerasium should be able to store something end-positive, which people gain over time rather than loose, (wild speculation ahead) such as wisdom or experience.
Stormfather! I think I might have found something!
Thoughts and criticisms?