Show me Rotovap slab.
Those that haz muffins are not after diamonds or pourable terps.
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See:
Oven vac temp and time for shatter
And maybe
Adding N2 in ovens to prevent muffining?
Or
Nitrogen Backfill on your Vac Oven to prevent Muffining
@WorkingOnIt; where have you sought the muffin man?