Talk:Dust/@comment-28189972-20170406011237/@comment-4010415-20170406013913

There's no telling how they came up with the combinations used to make the other types. Maybe gravity Dust takes a whole multi-step process of combining different Dusts and that's why we've only really seen it in Weiss' possession and in Ruby's bullet magazines - it costs more due to how much Dust it took to make it. I mean, I don't think we even see any purple Dust in From Dust Til Dawn.

So, it's possible that some types are more expensive and thus a little less available due to taking a whole string of combining Dust types to manufacture.