in SWIMs area meth amphetamine is often cut into or sold as MDMA. Swim discovered that 99% isopropyl alcohol will dissolve MDMA but not meth amphetamines. Other chems such as methylone will probably also dissolve in IPA, but it is a good trick to know! Those pesky meth amphetamines got the better of SWIM back in the day, SWIM didn't even know he was doing them! SWIM won't eat molly anymore, but if he was going to partake, he would not dare touch it unless he performed the ISO purification! Keep in mind, the meth amphetamine is so water soluble that even the 1% water in 99% IPA can still dissolve it if too much is used. Use as little IPA as possible when performing said test. IPA can be sourced at certain gas station as "polar pure gas line antifreeze" in a red ketchup looking bottle. It can also be made out of 91% IPA and salt/baking soda/epsom salt, although the concentration is more like 98-99% tops, I don't recall if it was anhydrous enough to use for said test. Hope that was of some help!