The Library Preservation blog mentioned a very cool Martha Stewert branded bone folder, made from melamine. I also picked up a nifty new bone from a flea market, but haven’t been able to identify the material it is made from. The coloring appears to penetrate the thickness. It has the density, rigidity and pore structure of bone. But the mottled appearance and seams on the edges could indicate tortoise shell which has been laminated. Or it might be some kind of horn.