Not to hijack, but speaking of pulling from spent material...
1. Is there any reason that basified bark material can't be re-acidified, cooked, salted and re-basified to completely break it down? I have a lot leftover from a botched drytek.
2. Can basified, filtered soup be acidified and reduced? I don't want to expose the freebase to too much heat, hence acidifying. What heat is acceptable? I have a few gallons of black water and reducing this (thus concentrating freebase content) would make it MUCH more manageable.
As.was already stated, extract until nothing happens. Freeze precipitation is a great way of reusing solvent, depending on the tel.
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My cat is very interested in acquiring living P. viridis leaves and S. divinorum cuttings on the Eastern side of the Pond. Other cats are welcome to PM with suggestions!