Hello I was wondering about whether or not to use an amonia wash after the crystals have been frozen. I have previously freezed the slovent, poured off naptha and let the crystals dry in pan then scrape up and put to use.( This seems to work fine as it has provided an effective product) I am a bit paranoid though and dont want to smoke any lye or other impurities is it nessecary to further purify?? Thanks for the help!