Board Thread:General Discussion/@comment-25266931-20161228230634/@comment-4010415-20161229014758

We know they do have at least some stuff about Dust figured out and written down in the RWBY Bible, considering Miles actually said it's in the RWBY Bible.

He listed off a couple combinations (Fire + Water = Steam Dust, and Water + Air = Ice Dust), and then said there are other examples and he'd have to consult the RWBY Bible for the others.