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Why freeze precip?

Migrated topic.
I still don't get why bother with the freeze precipitation?

I mean, the naptha is completely evaporated within 30 mins, and then you scrape up the product. How is this different to freezing, pouring off excess naptha and letting the rest evaporate, in terms of what your left over with. Freezing takes at least 12hrs
 
Thanks 3rdI for not flaming me, I was expecting worse

Although... if naptha evaporates in 30mins, how can freeze precip be "the fastest" way to get to your spice?
 
When you have a large quantity of naphtha to evaporate it takes a lot longer then 30 minutes and a lot of fumes. It allows you to reuse your naphtha and IMO comes out with a much cleaner product.
 
Honestly, it should be no big deal to let it sit in the freezer overnight. As some of the others have alluded to, I like to freeze precip cause you don't get fumes, you can reuse the solvent, I get more well-formed crystals, and they're not contaminated with DMT N-oxide which results in a more yellowy, gooey product. Also, by what method are you having your naptha evaporate within 30 minutes?
 
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