Wonderful, this is a subject I dream of often. Out of quarantine finally. Do not reuse naphta more than twice. If you notice, when you evaporate a drop or two of the re-used naphta you will smell the cherry flavoring, or whatever the hell that crap is. Repeated use of this solvent WILL result in poorer and poorer yeilds. Also always use an excess of naphta to do the extraction, its readily available so use the hell out of it. The ammonia used should only contain H2O,NH3,and a chelating agent. Use an equal amount of ammonia to the syrup. Another problem that may result is the type of acid used. Little plastic lemons are the best, always use an excess of acid to the freebase. Use 1 plastic lemon for every three bottles, 24 oz's. The results are mind blowing at best, what I mean is, the results you get are very astounding. One more thing, never rush any step, and always shake the containers until you are really hurting. The Dex will take care of any pain that may result from the process. When I dream about drinking the lemon nastyness, I always puke, thats why you should find a pure source, its a lot better.