Almagum:
Why do you call this substance "Ice". I was under the impression that we were talking about Methamphetamine, or in it's pure crystal form, "Glass". "Ice" is a completely different compound, 4-methylaminorex (synonimous with U4EuH), made from completely different precursors(Norephedrine, Cyanogen Bromide, Potassium Cyanate, etc.).
Ok, now let me tell you about the real world. In reality, methylminorex, at least around here (and SWIM hasn't produced any) is mostly unseen and unheard of. I come from a very ignorant town. 'Round these parts people call pure meth "ice" or "shards", but mostly "ice-cream". I can't tell you how many times I tried to explain how meth wasn't ice until I was blue in the face. Fuck it. It's a useless fight. Try to except the fact that most people have a hard time telling their asses from random holes in the ground, so speaking about aminorex ring systems and substitution patterns is a waste of breath.
I have heard 4-mar called "the real ice" for years, but only on the internet. Do you get what I'm saying? Fact is, PPA is pretty much unavailable to most people, unless they have mastered the akabori condensation, or have plenty of propenylbenzene and NBS laying around to twerk some up with. Plus cyanogen bromide is nasty, and carbamyl formation followed by ring closure with an acid isn't a very popular route. You know what I meant when I said ice.
Bear with me man!