Are there “rules” governing gear “dyeability?”

[Omedon]

So, I’ve been wondering this for a while, and people are starting to ask me questions as friends join the game, and all I’ve had to respond with on some fronts are shrugs, so I thought I’d ask here.

Is there like a consistent guideline as it pertains to when to expect dyeability for weapons and armor? It seems so inconsistent to me! This dungeon drop is dyeable but not the next one, this weapon is randomly dyeable but others aren’t. It doesn’t seem to be a line along quality levels or modes of acquisition, it actually seems almost random!

Is there a general line in the sand that I’m missing or is it really just that impossible to predict? Is there something I can tell my friends where to look for dyeable gear and where not to expect it?