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SWIM used the same xylene for 4 250 g peruvian torch dried cacti extractions without a single problem or reduce in yield, nor any extra color in the final mescaline HCl. He is still saving it to use on his next kilo, as well. If one chooses to distill their solvents, this could be even more economical, and could allow one to use fresher solvents each time, but it's not necessary in SWIM's experience.
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