Board Thread:Speculation House/@comment-4010415-20170818122613/@comment-26397825-20170818124858

Hmmm...but Ice Dust is a compound dust, right? So for there to be crystals there must be natural occurances of it in the wild, where Wind and Water Dust have come together to mix as Ice without human interference. Perhap natural Ice Dust crystals are light blue, but synthetic Ice Dust powder (made by the dust being refined and combined by mankind's hands) is dark blue. Similar to natural ruby's and synthetic ruby's being completely different colours in the real world.

Otherwise, I guess they simply really can't be bothered double checking what colour the dust is supposed to be.