I prefer to freeze precip, dry.  Then crush/stir/dry again for a few days.  Repeat until a closed container yields minimal/nothing but DMT smell.

Then I leave it in an open container in the freezer, where the cold exhaust vents directly into the spice jar.  I keep crushing/mixing/stirring until it is as fine as a nice cornstarch. 

Keeping it very cold helps to prevent excess clumping/trapping of potentially unpleasant chems IMO, and can be brought  back up to room temp and 'tamped down' into clumps for easier loading into smokin' apparatus.

I keep mine under that freezer vent all the time, keeps it cold and dry, and blows off any further potential outgassing if it might occur at small quantities.