Here's two pieces of oak, taken from a pile of reject bowl blanks and considered to be un-turnable a few years ago, but since then I've gained experience and sufficient confidence to have a go at them.
The first had large areas of decayed wood, you know the type with oak, not the white rot type, but the dry, biscuity, dark brown stuff, mostly around the outside of the blank, hence all the texture under the beads. It's 19cm diam x 12 cm high.
The second one was more of a problem for its radial and ring-cracks, which were quite advanced, although it also had a few pockets of white rot. In other words, it was firewood! I had to turn the outside, the rim, and the first centimetre of the bowl, then bead it, scorch and scour it, and lime wax it before proceeding. Once hollowing was under way I was able to determine which pieces might fly, so they were teased out of the bowl and copper-riveted back in, with a little epoxy under them to help. Once finished, the top few beads were lightly rubbed with copper gilt cream, just to reflect the presence of the copper rivets. It's 32cm diam x 14cm deep.
C&C always welcome....I won't be at all offended if you don't like 'em!