Your writing confuses me a lot, I don't understand what you mean when you say that you get 60% amphetamine and 40% sulfate because this doesn't make any sense, the sulfate is just the salt that will precipitate when adding sulfuric acid to an amphetamine-free base, Just as if you add another acid such as hydrochloric acid, you will obtain the salt in the form of hydrochloride, so there must be some error in the writing because as such it does not make sense. The reduction of p2np by any means (al/hg or sodium borhydride) will result in amphetamine free base and each chemical will be free to form the salt that best suits it from the free base obtained by any reduction method. In reference to cleaning the amphetamine salts that could be contaminated by failures in the synthesizer, a good and the most used way by everyone is to dissolve the amphetamine salt in ice-cold acetone for a short period of time and filter it because many impurities will end up dissolved in acetone and amphetamine will not dissolve in acetone as long as it is very cold since its solubility in it is zero. I hope I have clarified something for you. Greetings and blessings.
