Hi all-
multiple rextallizations may be necessary to remove all the sulfur smell from the xtals.
SWIM used to take stump remover and dissolve it in boiling water, then decant the solution through a coarse filter with swirling, and repeat until the sulfur was no longer visible. The sulfur was saved and rinsed a few times with more boiling water and pooled with the rest with more filtering.
Then the resulting "clean" solution was cooked down to about 1/3 its original volume, then placed in the window with the pan at an angle to get a deeper resevoir, forming larger crystals. Rextallization was then performed until the smell of sulfur was minimal.
-catfish