I totally thought you were talking about freebase.
Oh well, at least someone helped you figure it out.
As for working the oil to crystallize, for me, when i evap an amount of fasw, i usually do so under heat and it goes rather quickly. This is for fumerates btw, not freebase (which also comes out as an oil due to fast evaps). By evaping the water quickly you are left with an amorphous gooey yellowish oil. Scraping this oil up, and spreading it out again, doing so a few times, causes it to harden up and dry out/crystallize. After lots of scraping, its almost white, and i then proceed to finely powder it using a shot glass as a rolling pin to crush it in the pyrex evap dish. This happens no matter how pure/impure the fumarates are, but if i let it dry out slowly using little to no heat, crystals will form.
Fumarates are extremely soluble in hot water, so i think its all remaining soluble until the very end, and not crystallizing until almost all the water is gone. Since this happens so fast, (the transition from soluble in the water, to dry) theres no time for crystals to form.
Doing this ^ with freebase leaves you slightly waxy clumps of amorphous DMT. Definitely not crystals.
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