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I'd suggest forming aqueous DMT.HCl, and an organic layer to catch the green shit. Separate, and basify the aqueous solution with a fresh layer of organic. You probably won't need much water or organic solvent for this, so you'll probably be able to form some nice crystals if you heat and cool the organic layer the right way.
Let the two layers have a lot of contact time (and surface area) before separating, collect product, and then add a small amount of solvent to the aqueous layer to pull out whatever else might be left. I'd think that since the aqueous solution will have a pretty high concentration of DMT, you should get some clean crystals from the first pull.
Some product will be lost, so try not to use more organic solvent than necessary to remove the green. Save that spice!
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