Got to play with some freshly cut Black Walnut branches - that came with the bark, and some moss, on. Wet, the heartwood is almost black and the sapwood is almost white. the contrast is startling. The problem is that branches seldom grow nice and straight and growth rings perfectly symetric around the pith. Throw in some knots and some pin knots and things get really interesting. Turning the piece becomes a hide and go seek adventure filled with wonder - as in "I wonder which way the heartwood around this knot runs?".
Anyway, what turned out, literally, was dictated by the wood. I just listened when it yelled "STOP!"
Another one of those "Did I really make that?" things.
Definitely a keeper, even if it splits or cracks.
Have a look.