User blog comment:Zolnir/Dust, The Ultimate Theory (Refined)/@comment-23784953-20130815123847/@comment-23784953-20130815131449

...That, I'll mostly give you.

But it's odd how Weiss' Red Mode in Myrtenaster can repel a giant sword, if Red is suppose to be fire. How's that work?

Weiss may have mentioned the most common types, which are the elemental ones.

I'd note that Roman's Candy Cane seems to shoot Orange Dust Crystals, which he demonstrated in his first short.

Then after he tosses the Red Dust Crystal to Ruby, then shot it, it emitted an explosion twice as large.

To further drive this point home, his first shot barely had a red mist post explosion. Second time he did that, a red mist can be seen after the explosion.

Actually, addendum: Red Dust is a catalyst type Dust that enhances other different Dusts or whatever it's applied with at the moment. This is far off, because before Ruby sneezed, a mixture of most of the variants of Dust (except White, Green and Gray) can be seen, it's possible that the Dust mixture may not have exploded if Red Dust was not mixed in, which Weiss mixed in, the last time she shook the Dust vial..

This will also explain why Weiss' Red Mode repelled the giant sword, it enhanced Myrtenaster's durability to the point that it's tough enough to repel something that huge. And it also gives a good explanation on Roman shooting the Red Dust Crystal and causing a larger explosion.