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Since the bone is porous I believe you would need to seal it. I have no experience with that process, so I will defer to those who do when it comes to the how.

have you tried putting it to the stones to see if the bevel can in fact be made clean? Pitting on the surface does not always necessarily mean a bad edge.

I would polish the tang and spine. Then, as was recommended, use polish and a rag on the blade to keep some patina and more importantly, the etching.