Originally Posted by pnw bb
i think what he is getting at is why do people use cold butane even though its slower. obviously we know that its slower because of its increased viscosity. but i think the valuable information he is looking for is that we like sub zero temps because the solvent becomes more selective at those temps not pulling as many undesirables and water content. warm solvent is much more aggressive. for those looking to make high quality and boutique level extracts the colder the better.
The key is that the molecules we seek are primarily C-10 through C-22, and the molecules we avoid are C-30. Extracting at low temperatures limits extraction of the C-30 molecules more than it does the lighter ones.
Solly SM, I haven't seen any viscosity charts, but we typically add propane below about -30C and extract down to around -50C with it.
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