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.
...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