It's worth doing the Marquis test just for peace of mind since it's also a good idea not to take any assurances of safety at face value if there's something missing in your understanding of the situation.
That said, your product should be safe - fumaric acid is an edible acid at mescaline dosage levels. The question is, how active will it be, since your results seem to suggest a considerable amount of fumaric acid contamination. This throws off the accuracy of dosing, so ideally we'd work out a way of sorting this out.
If there's no specific recommended recrystallisation solvent for M fumarate yet, I'd probably start with IPA. There's a possible issue with fumaric acid itself being difficultly soluble in most solvents which ought to be taken into account.
To me it feels like adding an excess of fumaric acid crystals to the EA essentially in one go may have been the source of the problem. Do you think this section of the method ought to be rewritten in order to articulate that nuance more clearly?
That said, your product should be safe - fumaric acid is an edible acid at mescaline dosage levels. The question is, how active will it be, since your results seem to suggest a considerable amount of fumaric acid contamination. This throws off the accuracy of dosing, so ideally we'd work out a way of sorting this out.
If there's no specific recommended recrystallisation solvent for M fumarate yet, I'd probably start with IPA. There's a possible issue with fumaric acid itself being difficultly soluble in most solvents which ought to be taken into account.
To me it feels like adding an excess of fumaric acid crystals to the EA essentially in one go may have been the source of the problem. Do you think this section of the method ought to be rewritten in order to articulate that nuance more clearly?