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To obtain white fluffy xtals, and separate NMT from DMT you should do that way:
When you do your pull with naphta, you should do it at high temperature.
Put your basic solution in a 1L glass bottle and add 200-300ml of naphta.
Put the bottle in a hot bath with boiling water (be very careful, and let the pressure release from time to time). Shake the bottle, let the pressure release. Try to keep the temp as high as your hand can handle the bottle (I guess 45°C). When naphta and basic solution are at the same hot temp, there is no more pressure to release. You can shake it like hell, if your solution is well filtered, pH high enough, and temperature high enough, you shouldn't have big emulsion. Once well shaked, let the emulsion disappear, this can be helped by pouring some boiling water on the closed bottle directly on the emulsion (again be very careful to release the pressure). Once the emulsion is gone, pull the naphta out from the bottle, this should be done when all is still hot.
The naphta is now oversaturated and very hot, by cooling, dmt xtals should appear at room temperature.
Put the hot oversaturated naphta in a dish, cover it with plastic film (no evaporation) and let it sit at room temp. After only 30 min you should observe xtal formation, wait 3 hours or more until xtals stop growing. You can now pour the naphta out from the dish letting crystals dry.
It's better to reuse the saturated naphta for next pulls. Do pulls until there is no more xtals forming at room temp. Using 1L of naphta is ok but for 100g of bark, may be you can use less.
Once you collect a maximum of xtals, keep the naphta and let evaporate (or freeze precipitation). You should obtain an oily orange/brown goo which is nmt and other compound like betacarboline.
