Board Thread:Speculation House/@comment-24019512-20140730215917/@comment-25555436-20150324001542

...Le shit, I didn't expect both an anon and for you Spartacus to respond to a thread that has been dead for about 9 months, in about 1 day.

As for the question per se, I'm perfectly sure that Dust is inspired by alchemy at least in part, and while I doubt Monty knew anything about alchemy, he did watch FMA. Though these things having the same colors as the main 4, is a coincidence. He said it himself, he woke up one night, these 4 colors appeared in his mind like a Deus Ex Machina, he wrote them down, went to sleep.