A sealed ampoule of pressurized supercritical liquid Carbon Dioxide embedded in acrylic.  Purity is 99%+.  This amazing sample will phase change before your eyes when heated to 35°C.  Let it cool down below 35°C and watch it condense back into the liquid phase again.  This is truly an amazing sample and fun to watch!  This fits perfectly inside the included 1 dram vial for display.