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I'm not going to ask what malatium does in feruchemy, but it'd be neat to know if Sazed had a chance to experiment with the little bar of it Kelsier found. Did he get around to trying it offscreen during the first trilogy?
Yes, but he didn't get far.
Will we ever find out what EXACTLY gold is? That's been bugging me as well... it doesn't seem complete.
I leave gold intentionally vague, I'm afraid, even by the end of book three. I do this in novels, particularly when I feel that I might do more books in a world later on. The events of books two and three don't lend me to spending much time on gold or malatium, so I figure I'll save really digging into them when I can have a character more focused on them. (I'd someday, for instance, like to do a Malatium or gold Misting and see if I can do anything interesting with them.)