The above are eight turned pieces from a single 24″ section of a 24″ diameter white oak from Boaz, Kansas. The tree fell over and across the Van Horn Branch Creek about 10 years ago- We finally pulled the log out 2 years ago, and it has laid in my log pile since then, although I did mill a portion of it. The heart wood is still green, so these bowls were turned green and allowed to warp as they dried. Ultimately all the pieces were exposed to ammonia vapors (fumed) which reacted to the tannins in the wood, darkening the surfaces.