I would not bother with heptane until you have relatively pure spice crystals as heptane is mainly for the very last cleanup steps. Personally I don't find heptane to be any different from hexane for this purpose.
I would probably once again acidify into solution with vinegar and then basify DMT which is this dirty, and re-extract it from a smaller volume of liquid. I recently did this and obtained very pure spice from some barely crystalline crud. I avoid sodium carbonate washes but you might have better experiences with them.
After that you can recrystallize that in the usual manner to obtain nice white glassy crystals. Info on how I do this can be found here :
https://www.dmt-nexus.me...aspx?g=posts&t=42775Art Van D'lay wrote:Smoalk. It. And. See.