It's not as black as the new black, but it's comparable to old black:
This result was gotten by mixing green and purple, a trivial cost of something like 220 gold at most.
So how about everybody gives it a go and posts their results?
I can say right off the bat that warrior Istani looks particularly good with this combo

(actually leather) so any discrepencies(sp) should be based on the fact its different materials not different base colors 