GEC Ebony wood

Ebony is fairly stable, with a lot of natural oils, IIRC. I've had good luck with natural ebony so far.
 
No need to harden/stabilize ebony. I have a number of hundred+ year old antiques that bear testament to that. And my experience carrying ebony scaled knives on a daily basis confirms that.
 
It's worked very well as guitar fingerboards and bridges, for years. I'd say it's pretty stable.
 
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