earylwood to latewood ratio are tight on the staves. I'd say the growth tings are 1/8" thick.
I've knocked a little bit of the sapwood off one of them and the heartwood wood appears to be blackened a little bit, but that may sand out. I'll keep working on it and try to post pictures later.
Osage is heartwood at supposed to be resistant to rot, so I'm being optimistic that the wood will still be sound.
side question: can this mold affect other staves if I store them next to my "clean" ones?