I've heard that a proper beauty salon can do lovely blue-in-the-sun, black-under-most-lights things with dark hair such as mine (looks black to the untrained eye, is actually a very dark brown), and since I keep it braided most of the time (it's not quite ridiculously long, but the end of my braid goes past my bra strap) it's easier to conceal a hint of blue than if it were loose all the time.