It's sometimes called a hot "water bath". Get a cooking thermometer to measure 50 - 100 deg C to make a hot water bath. You just put your jar of [Basified + naphtha] into this, to warm up to 50 - 60 deg C. Fill a pot with screaming hot water from the tap, and put on an electric stove set at 1 or 2 on the dial, where 10 is max. Measure temp to be sure it's at least 55deg C which is hot enough to dissolve all dmt. Boiling hot naphtha is an exaggeration, and it evaporates much quicker when warmed more than 55 Deg C. But unless you are trying to recrystalize dmt, why heat the naphtha ..? What tek calls for hot naphtha..?!~ .. I feel that hot naphtha picks up more lye than cool naphtha (20 deg C), as well as all other impurities. I would think it's too risky and hot naphtha yeilds not much more quantity. Really - why are people heating up naphtha..? I speak from swim's experience who made bad quality, lye-contaminated dmt once, this way... The temperature of the non polar solvent is critical to it being selective towards just dmt. For example, any heated NP solvent will pull much more stuff from basified MHRB than 'cool' NP solvent. I say in any extraction, follow the proven protocol including the indicated temps. Naphtha at room temp is already very selective for dmt, and swim get's no more after just 2 pulls of basified MHRB.