“In fact,” Kelsier said, “many Mistborn keep their copper on all the time. It burns slowly, and it makes you invisible to other Allomancers. It hides you from bronze, and it also prevents others from manipulating your emotions.”
Vin perked up.
“I thought that might interest you,” Kelsier said. “Anyone burning copper is immune to emotional Allomancy. In addition, copper’s influence occurs in a bubble around you. This cloud—called a coppercloud—hides anyone inside of it from the senses of a Seeker, though it won’t make them immune to emotional Allomancy, like it will you.”