actually....
I'm nearly positive the frame isn't anodized, when you anodize with color you actually use a dye, and its not as strong so usually they clear powder coat over the anodization - it doesn't make sense for yammie to do that.
Actually, though, I don't think it's powder coated either - I think the frame is parkerized - its a finish very similar to powdercoating, but stronger - usually you see it on guns- it's very thick and usually not a perfect black, but more of a very dark grey. If it is parkerized, I can tell you i think it's better than powder coating, the finish is virtually invincible.