When ivory was banned, the Japanese culture, which depended heavily on ivory, was left in quite a lurch.
It seems that the Japanese businessmen used ivory to carve their signature stamps. The demand was high, and there was nothing in the world that behaved quite like ivory.
Evrina was invented as the ideal human-made replacement for ivory and was the only "perfect" material. Unfortunately the material cost quite a bit to make and the entire project was disbanded.
We were able to purchase the remaining Evrina for the Kopa. (should be enough for the run, or maybe a little under). Cow bone or other human-made materials just won't carve and show as well.