User blog comment:Zolnir/Dust, The Ultimate Theory (Refined)/@comment-23784953-20130815123847/@comment-11188061-20130815124459

Not true. Weiss clearly stated the 3 Primary Dusts when she bitched at Ruby, "Fire, Ice, Thunder, Energy!" Also, when asked for a 'pure, uncut' crystal the shop keeper handed over a red crystal, which was also the one Roman blew up in fire and flames when he fired a shot of Dust at it.

In conclusion, the real Fire Dust is red in color and Orange is a mix of more Fire and Thunder (which causes destruction and explosion).