Yeah, you can find detailed teks if you search google. Basically you're just using a really basic solution to turn the DMT in the bark to its freebase, which is soluble in naphtha. Since MHRB doesn't contain too many other non-polar compounds that are also readily soluble in naphtha, it will yield a fairly pure product.
The logistics of how you accomplish that are up to you, really. You need to basify water to pH 14 in some type of degradation-resistant container (like an HDPE jug is a good choice), then add powdered root bark (let it sit for a while to let those amines get their vulnerable protons pulled off by the base). Then you add the naphtha and the hydrogens in the naphtha act kind of like velcro and pull the DMT out of the basic solution. The deprotonated DMT molecules in the basic solution want to move from an electronegative state to a state of neutral charge, so they transition readily into the added hydrocarbon.
You have to be careful not to get an emulsion layer. Its like an annoying foamy layer that takes forever to go away, you avoid forming one by adding the naphtha slowly and mixing only by smooth and gradual oscillation.
After gradual, smooth mixing for a while, you can remove the top naptha layer with any type of suctioning device. Turkey basters don't work very well, oral syringes work better-- if you can get a hold of a big half-liter syringe that is used to administer nutritive liquid to patients with feeding tubes, this works the best. You can control it with remarkable precision, and you don't have to repeat suctioning an annoyingly large number of times as with a typical 10ml oral syringe.
Transfer this naphtha, and the naphtha from subsequent pulls into a glass container and then let this evaporate under a fan on a low-setting until it is roughly half its original volume. Then seal the container, and put it in the freezer. Forget about it for a few days or a week, and when you come back to it, the container will be a snow-globe of crystals. Working quickly as to not heat up it up, remove the top of the container and suction off the naphtha gently with an oral syringe-- the DMT crystals will remain clumped together on the periphery of the naphtha, having precipitated out of the solution. Now just set this jar of wet crystals out in the warm air to dry, with a light fan blowing over it (plenty of ventilation, naphtha fumes are flammable). Soon you will have freebase DMT crystals.
You can still evaporate the remaining naphtha pulled off from the freeze precip and see what remains, but probably not much. Wear goggles and neoprene gloves when working with lye, it can blind you.
Any supermarket should have it. Look for distilled vinegar.
