Hey
Yeah its possible after some time some dmt crystals precipitate. It never happened to me but I heard of it happening to others. 1.5l basified liquid for how much mimosa?
As for sodium carb mix, yeah you got it.. FAQ also explains it:
https://wiki.dmt-nexus.m...hould_I_wash_my_spice.3FIf its dmt, when you manually separate the gunk and use warm naphtha, it should dissolve it and lye shouldnt. In any case after you do that, doing that sodium carbonate wash will make sure 100% there is no lye. You can do two washes if you want.
You can always recrystallize again if you want (also as FAQ explains) if you are not happy with your crystals, but it should be already fine this way
Good luck and tell us how it went