Board Thread:Speculation House/@comment-124.170.71.149-20131218072814/@comment-4010415-20151121203348

We haven't seen any true evidence of there being brown Dust. By process of elimination, the theory is that earth Dust is white.

My guess is that the light blue Dust makes some kind of invisible force field that produces light blue shockwaves when struck. That's what Neo and Weiss used, and that's what the colosseum uses to keep competitors and stray bullets from flying into the audience, as evidenced by the light blue shockwaves that appeared when Reese, Reese's hoverboard, and BRNZ hit the wall.