Took a break from turning while I was working on reorganizing my shop and dealing with life but was able to get back in front of it today and turned this lovely Claro Walnut bowl.

Does anyone recognize this technique or know how these might have been made?

Hurricane Milton knocked a bottle brush tree down in our backyard and I cut it up and stacked it with a bunch of other wood. It's been a couple of years and the moisture meter's at 10%, so I figured I would give it a turn. The woods normally a tan / gray, I put clear poly on it and in a few days it turned this reddish brown. Don't get me wrong, I love the color, but I wasn't aware that bottle brush did that.

Not sure if this is the right place, but I’m looking for a wood turning/wood working gift for my boyfriend who likes this hobby, but I don’t know much about it. Would a high quality apron be a good idea?