You can use fasa (acetone), also a trick for using fasw-
Weigh the exact amount of fumaric acid you use, then evaporate your water and weigh the product. If its approx 3x heavier than what you put in, it should be mostly dmt fumarate with some impurities. dmt fumarate should be 20-25% fumaric acid by weight. Granted, theres going to be impurities, but if your adding 200mg of fumaric acid, and getting 500mg of out you know your using too much acid.
I use this method, and guestimate how much fumaric acid to use based on yeilds from previous extractions on the same bark. Keeps fumaric acid contamination to a minimum. You could also just fasw out your dmt with excess fumaric acid, then make a paste with that and equal parts lime and dry it. Pull with dry acetone/iso, and fasa/i that to get pure dmt fumarate. I find you save alot of alcohol this way, but its a bit more effort involved.
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