All the zebra and giraffe bone that is available these days is fossilized to the best of my understanding. That's why it has all the colors in it, not from dye. Like ivory, fresh bone is not sold because it would encourage poachers.
When I looked at the Jantz listing for zebra the first bunch said it was resin filled but further down in the list there are some that don't say that. In any case, stabilizing shouldn't be necessary as they are already fossilized....
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