It's good to put cold water in the jar, but also put the solvent in at the same time and then roll the jar in a tub of water heated at 50-60c for an hour. There's no point having the spice hanging around in NaOH when it could be nuzzling in nice warm solvent.
I'd only recommend using A/B for extracting all the alkaloids as it gives a cleaner starting product, but with STB you can do all the freezing you want to get things nice and clean.
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