User blog comment:Deafro/Theory on Dust Manufacturing/@comment-4773581-20140112153919/@comment-4773581-20140113022809

Jaune*

Hey, don't look at me for an in-depth explanation. I'm just going by what the opening narration implied. For all we know, they might not have had Aura back then, or maybe we've seen nothing but the small fry Grimm. They've also only ever been shown in numbers that were advantageous to the hunters-in-training, being relatively small groups, and not in the overwhelmingly large horde that's implied by the ON. Imagine, for a moment, an area teeming with King Taijitus, Giant Nevermores, and Deathstalkers. Now imagine such an area having a moderate-to-low threat level relative to what else is out there.

I don't buy your explanation, either. A small amount of dust relative to the area it was in was enough to cause a pretty big explosion just from being set off by a sneeze. Also, if it isn't immune to all forms of energy, then all types of dust would, and should, get their element overwritten by a combination of light and kinetic energy. And if they aren't completely immune to their own energy, then in many cases they should logically be set off by whatever they were exposed to to "charge" them in the first place. Especially electric dust, given that making that involves getting struck by bolts of lightning, which are very powerful on their own. And they also wouldn't have had any way to tell when any of the dusts were complete, either, so the likeliness of them being left to overcook is extremely high.