.....otherwise, add alky to pills (normally after grinding) and stir well for several minutes. Let all the pill mass settle back to the bottom, and allow the alky layer to get as clear as possible before pulling the alky off, and adding another volume to the PM and repeating. Swic used to wait 30-60 minutes before pulling the alky off the GUPS. Now he only uses a Tyvek membrane when doing alky pulls, and he DOES do 8 hour MeOH soaks for that. It's a lot less stinky than denat, but they both work about the same. ISO works the best for yields, but pulls to much trash out with the goods.
Later
CN