A sealed ampoule of pressurized supercritical liquid Boron Trichloride.  Purity is 99.5%+.  This amazing sample will phase change when heated to 178.7°C.  Let it cool down below 178.7°C and it will condense back into the liquid phase again.  This is truly a amazing sample!  It is not recommended to heat these ampoules to the critical temp because they could burst. This fits perfectly inside the included 1 dram vial for display.