Hello everyone. I need a hand. I'm designing something special and I need some help to find a substance that I can make or buy that I can form into something the size of a baseball, and be able to cast an object in the center of it and be able to break it apart easily and cleanly to reveal the object in the center. It would be really nice for the material to be pitch black, or colored to be pitch black all the way through I'm envisioning some kind of rubber or silicone resin or home-made concoction that can be mixed with some colorant and poured into a mold with the object in the center and breaks using your hands* into dime-sized pieces and not leave a residue on your hands. Thanks in advance for your help.