How to remove permanent marker from stag?

Joined
May 13, 2008
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34
A friend owns this knife, which has much sentimental value to her. Someone at some point drew a 2 or N on the stag handle. Does anyone have a recommendation for the right solvent to remove it without damage?
Thanks!
Jonathan
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I have always used acetone but that has been on wood with a finish over it so I don't know if it will have a negative effect on antler.
 
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