I have a theory

Do not confirm or deny my theory I just want to say this before I find if I’m right or not

I think that having metal penetrating your skin gives you the ability to burn that metal and more powerfully at that vins earring lets her pierce copper clouds and the “sword tip” in spooks shoulder gives pewter as the nails in steel inquisitors give other alomantic powers at a large scale that’s why marsh became Mistborn with becoming an inquisitor I’m not sure wether it only works on previous alomancers or any average joe but this is my theory