i would use everclear or methanol. isopropyl has been know to mess up harmalas and make a new compound called harmala red. iso works for some people, and not for others. try dissolving a small amount of harmalas in it first and evaporate to see if its red.
High proof grain alcohol is preferred, but isopropyl will work, even 91%, although you'll just have to evaporate more water due to the 9%.
If you plan to disolve harmalas in the iso, heating the iso in a hot water bath helps to dissolve the harmalas (as harmalas are 'slightly' soluble in iso). Never had an issue this way.
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