Part of the work was already done for the ring that I made so I will just cite my other instructable: Celtic Knot Bone Ring
The close-up pictures were taken with a Pentax K10 D and a Tamron AF 90mm f/2.8 SP Di macro lens.
The other pictures, with a Pentax SMC-FA 50mm f/1.4.
Step 1: Material
In Italy, especially in my region, we prepare a very good sauce with bone marrow. It is called pevarà (sometimes pearà) and it is made of bread, bone marrow, beef broth, butter and a lot of pepper. In fact its name literally means peppered. So that is why I have those big bones lying around.
An important point is the cleaning of the bone. After the cooking the sponge-like part of the bone is full of red bone marrow and that is not good if you want to work with the bone. The best way to clean it is to put it in the dishwasher!
I was surprised, when I first tried this trick, how good it worked. It perfectly cleans every part of the bone and exposes the sponge-like part.
I put also some close-up pictures of the sponge-like part because it is too cool. Our bones have this kind of structure near the ends to make them light but strong.