So I got a couple of stag in Scotland and they're boiling out the skulls. I saw some old skull caps on boards over here and they have writing on them. After I bleach the skulls, what kind of pen/ink should I use on the bone? Just a permanent marker would look a little tacky and I would think it would disperse and soak into the bone.

Thanks in advance for y'all's help.
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...and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. Gen. 1:28