Jim, I have always admired your use of bone. I have delved into bone processing only once with mixed success. I bought a bunch of raw big steer leg bones from a country packing house out a side road from Memphis out to about Arlington. 'cost $0.69 per LB. They apologized for the price, but said the Asian restaurants bought all the bones to make soup stock and drove the price up. I boiled the bones in a stong solution of SODA. Washing soda, Soda Ash, Pearl Ash, Salatus, Carbonate of soda; Sodium Carbonate. Much like TSP, it will degrease and clean nicely. Useful stuff to keep around the shop. I didnt end up with much useful bone.