I put some steel wool into a plastic coffee can with some vinegar about 12 months ago. Noticed last week the steel wool is gone....I kinda forgot about it other that a couple of test pieces this winter. It froze and thawed quite a few times. It turned the oak jet black in about 2 seconds.
The bowl is 7" round and about 4" high. Another thicker one, but no cracks yet, finished 1 week ago. Thickness is uniform on sides and bottom about 1". I think a gloss poly or laquer finish on the un-ebonized rim will make it pop more, what do you think?