After the piece has cooled
enough to handle, sand the roughness and the residual pencil marks off
of the face of your work. I use wet/dry sandpaper with grits 320 and
work up to 1200.
Dry the piece with paper
towels, including the scratchings. Let the piece dry totally, overnight
if need be.
Put a blob of black acrylic
paint onto the center of your picture and using your fingers, rub the
paint into the scratchings. Quickly swipe the surface with a damp paper
towel to remove the paint from the surface but not from the scratchings.
Let the piece dry.
Sand the surface to remove
any stains left by the paint. Be careful not to sand so much that you
remove your scratchings.
The next thing you do is
to make your bone or ivory piece look more real, aged, and earthy. Put
a blob of burnt umber acrylic paint on the surface and rub it around,
both front and back and on the sides, and then wipe it off, leaving
behind a slight color.