Receystalized 2-3 times then I just gave up and let it dry for a while, my previous attempt I let sit for a week and a half and it never became waxy, when I hold a flame to it it just smells bad but does not catch fire, would it be safe to assume it’s ready?
We've all seen it, a clear (sometimes yellowish/orange) residue that doesn't resolve. It's frustrating. Sometimes it is due to impurities, but often it's simply a supersaturated solution of unresolved polymorphs. I've recently applied a couple effective strategies to resolve it. One involves adding ethyl acetate, with a glass dropper. I add just a few drops, swirl it around, and pour into another clean flask. As it evaporates, it usually leaves behind clear crystals, which are suitable for seeding.
Another effective strategy is adding a small amount of boiling methanol. Since methanol has...
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