User blog comment:Icchi/Let's talk about Dust (and Aura) part 2/@comment-11188061-20130826154655

For the majority of your explanation I am not going to say anything, simply because they're pretty generic and has probably been stated a hundred times by just as many commenters.

On the other hand, your final assumption that only the White Aura can heal is probably wrong, though still possible. I'll present circumstantial evidences to both topple or support it:

Topple: Phyrra did not know the 'color' of Jaune's aura, and yet when he got hurt she immediately asked why he did not heal himself with Aura. This could mean that anyone who could use Auras, no matter what their primary colors are, can heal themselves. It is common sense among Aura users, or at least through Phyrra's eyes.

Support: For now, there's nothing that says that a person's Aura can only consist of only one color. It's possible that Aura users can use all colors, and thus the White aura = healing theory is definitely possible.