Nice! For show, I would try to levitate. Probably using a stronger magnet, inside a small (tiny?) glass tube, so it slides up a bit. I wouldn't do "rock surgery

Nice! For show, I would try to levitate. Probably using a stronger magnet, inside a small (tiny?) glass tube, so it slides up a bit. I wouldn't do "rock surgery" just yet, to remove dead weight. Levitation with 4 magnets in a checkboard fashion, as usually done for pyrolytic carbon sheets, maybe doesn't work as the sample is not flat. Also, turning the magnet upside down seems useful. And then, heating up to show that it drops at a certain temperature. I wonder what would be needed in this case; I guess less than 100° C. In any case, the "show" part is important. Good video quality is important.