oil

I suggest butane or hexane over naphtha which is just a general mix of light hydrocarbons.. and yes, you should always purge, if you can't afford a vac you should put over boiling water if your using naphtha or butane. An etoh ever clear or iso wash is much easier to evap and doesn't require true "purging" for it to be completely removed. I dont evap with heat..it largely affects the quality and consistency/texture of the final product

i made oil a month ago with popcorn buds and quality trim, ran some 5x refined butane, (expensive as fuck) thru a thick glass tube, with brown coffee filters zip tied on one end. had my electric griddle on low, and cooked it in a pyrex dish. vac purged until i get that waxy consistency. amazing

crookedfinger said:

I've read quite a few posts and watched a few videos on youtube. My question is, after you wash the material with the solvent (naptha, or everclear) is the "cooking off" of the solvent a necessary step in the process. Or is this just in the interest of time? Can you let the solvent evaporate naturally without effecting the end result? Will all the solvent evaporate without added heat? Thanks for any input.

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99.9% of the solvent will evaporate away on it's own, but for the molecule to readily escape, the pool must stay liquid. We like 115F at -29.5" Hg.