Very interesting site. I have a chess set (red and off white pieces) that I've always wondered about. Someone awhile back said it was celluloid and someone else said that celluloid and Bakelite were the same thing. Yet another person said ivory for the off white pieces. I conducted my own "test" a long time ago. I took a small scraping from the bottom and lit it on an old spoon and it smelled like burning plastic. Definitely not ivory (lol). At the time, I hadn't heard of Catalin. Guess I'll try the Fantastik test.