Back in my much younger years, I worked preparing skeletons for sale
to scientific supply companies.
Step 1: in bone prep is to boil the bone totally clean...boiling
water for about 1-3 hours dependant on bone quantity.
Step 2: degreasing: soak in Carbon tetrachloride (next to impossible
to get a hold of these days) alternatively soak in a solution of
TSP(tri-sodium phosphate) substitute for 1 hour-3 hours dependent on
fat tissue in the bone and amount of bone...soak until bone removed
from solution is evenly wetted.
Step 3A: Bleach in (Clorox--TM) (sodium hypochlorite solution) for
two - six hours to get bone white...any longer and the mineral
components go into solution. The bone comes out from this soak as
pure white and opaque as possible.
OR Step 3B: soak overnight (8-12 hours) in strong (13%) hydrogen
peroxide. This gives the bone tissue a slight transparency with a
slightly off-white color tending towards yellow slightly.
Step 3-1/2: if the bone structure needs to be altered by bending,
twisting, etc. do this while the bone is still wet for Step 3A or
Step 4: Dry at least 48 hours (clamped in position if form has been
altered) before drilling, assembly, or sealing.