6dc5455c____The_Coppermind___17th_Shard__Entry
[Chapter] 76 [Entry] 
I've always wondered about the strange ability Allomancers have to pierce the mists. When one burned tin, he or she could see farther at night, looking through the mists. To the layman, this might seem like a logical connection—tin, after all, enhances the senses. The logical mind, however, may find a puzzle in this ability. How, exactly, would tin let one see through the mists? As an obstruction, they are unconnected with the quality of one's eyesight. Both the nearsighted scholar and the long-sighted scout would have the same trouble seeing into the distance if there were a wall in the way. This, then, should have been our first clue. Allomancers could see through the mists because the mists were, indeed, composed of the very same power as Allomancy. Once attuned by burning tin, the Allomancer was almost part of the mists. And therefore, they became more translucent to him.
The Hero of Ages/Epigraphs - The Coppermind - 17th Shard
Entry