Porky, I think you can get above 98%, but yes, what he said. You can't get pure anhydrous alcohol, or at least, as soon as you expose it to our atmosphere it won't be. As for rubbing alcohol/everclear, they should both be fine. Iso is cheaper, I don't know which JWH is more soluble in, I would ASSUME the higher alcohol (iso) but either is fine. Just make sure it evaporates TOTALLY. Also, make sure if it's iso that it's very high proof, and doesn't have any strange colors or astringents or anything added. Good luck, and let us know.
I find the synthetics passable, but as others have said: dosage is variable, ingredients can be new, therefore dangerous, expensive, more because they can. Each spice can very on content. Mystique, my preferred blend is made up existing legal herbs, they don't mention extra chems, which if contained is alas dishonest, and dangerous. From effects standpoint, it's like being sober with a mild trippy head space. The thing that I dislike is if I dose high it causes a really trippy, panic attack esque feeling. But in low doses, doesn't have a cross-tolerance with cannabis and no short term memory problems. Overall, shows the war on drugs failures and people's desires for psychoactives. Most people that smoke it are on probation, or can't find green, and a few that are allergic to pot. Seems education is the best source of harm prevention. Yet, people think harm prevention means acceptance. It's more being smart about what you're ingesting, and realizing bad things can happen, especially if being stupid. (Natural selection? lol) It's unfortunate that dogmatic education (lookin' at you D.A.R.E.) and laws cause more harm than good. People want their psychos, yet the FDA can't make that money money cause they can't patent it... so quality control goes to hell, and dangerous things ensues. ....hmm, sorry 'bout the rant.
A few years ago it wouldn't, but there's like a 103% chance that shit has synthetic cannabinoids on it.
^ and protected by "Not for Human Consumption", despite well knowing it's destination. chaps the arse thousands gettin' pinched for ganja when hundreds(?) and thrown sometimes to dangerous places by synths. ty though.