One of my reactions calls for a cold bath of -91 degrees celsius. This can (per theory, at least!) be achieved using a slurry bath consting of heptane and liquid nitrogen. I tried doing this, but did not achieve the requisite slurry, only heptane lumps in a steaming heptane bath (which was kind of dissapointing).
Do anyone have any tips or tricks to make the slurry? I was thinking using a mechanical stirrer next time (I only used a huge magnet). Maybe this will help?