Brad Vietje
Dave,

Cool stuff.

In my experience (and opinion) Apple doesn't generally spalt in ways that are as wonderful, colorful, or useful as Maple and other species.

In your first photo, you can see the grey-ish dark line separating live, pinkish wood from the dead wood (well, live before the tree was cut, at least...). Within the dead area there are at least two different stages of spalting. The area closest to the "live" wood shows distinct growth rings, reddish-brown color with dark growth rings, along with little flecks of lighter color. The other area (toward upper left, as shown) holds little detail, looks greyer, punky, and doesn't cut well.

In my experience, the darker areas of spalting can be worth turning, while the rest is shot. The spalted areas are usually a lot weaker than the sound "live" wood, and they won't shrink the same, as the spalted areas have less integrity, and less resistance to warping.

I hope you'll show what you make from this wood, and how it turns out.

Safe spinning,

Brad Vietje
Newbury, VT