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Interesting,mammoth ivory is even worse (much closer grain pattern called shreager lines (SP)
If you have a need I have vintage ivory scale material,do not do scales but use it for inlay work etc.

To a point yes,Ivory can be funny stuff,It actually moves I:E it expands and contracts with changes in humidity and temp.
Have made quite a few solid Ivory brushes,you can mic them and see changes...

I work with Ivory on a daily basis,it has to breath or it will crack.
The coating of choice is mineral oil.