Thanks, guys!
Have you applied some sort of weathering to the armor, or are my eyes deceiving me?
So first I applied a black wash, not thinned at all - which turned out a bit heavy.
Went back and layered up the armor. Then did a wash of carroburg crimson, let it dry, then followed with Druchii violet, out of the pot, but applied carefully. That's probably what created the effect.