I have had crank aka powdered meth that was as pure as most Ice is. I used to live in an area where I knew about 10+ meth cooks when I was in high school , and I did a line of crank in 1995 when I graduated, and it was very pure, and I knew cooks that made dope that was tested(by the cops after a dumbass got busted with a gram) at 96% pure. Ice is about that pure or sometimes more pure than that, but rarely on the street is Ice much over 80-90% now in this area, unless you buy a pound of a Mexican gangster you normally get the same purity as the crank in the 90's was, sometimes much lower.
Not all crank is crappy becasue it is a powder and not crystals, many ammonia,ether,lithium metal, pseudoephdrine made crank is often 90%+ pure. And when making that type of meth aka Birch method.. when you add the litium or better yet, sodium metal to the anhydrous ammonia+psudoephedrine solution it is called "Bluing the dope" it turns the solution blue as litium strips or sodium metal is added, and a sometimes dangerous reation occurs, which is why you have to add more ether at this point to keep the whole solution from bubbling out of the container.
I knew this one guy that cooked blue powdered/rocks of crank called "smurf dope" becasue it was blue, and he did that on occasion becasue it was super spinny meth, lol..it made you super amped up to the point of wanting to just run or whatever becasue you could not stay still..lol..made me paranoid though, where most of the white ether crank rocks were a hard rush that made you feel like superman, and you were so fucking amped up you were not paranoid of the cops, it was like meth+steroids feeling I guess, you felt unstoppable and not paranoid, not for a few days of doing it anyway.
But I smoked Ice when it started flooding everywhere around here, and It was great to smoke if it was purer than the stuff they ended up selling 10 years later after they busted 50 Mexican people and got over 100+ pounds of Ice that was going locally and to Indiana, Ohio,etc..lol..I do not do meth anymore, mainly becasue you have to watch out for tweekers cutting it with MSM, or something that looks like crystal, fake dope as a cut, no thanks.. and I'm about to turn 34 in May and I like having my teeth, plus heroin and opiates are much better mentally and physically IMO..
The only meth I ever had was yellow but seemed good enough to me. That was the early 90's though. What kind was that?
we called it "Barstow Lemon Drop" usually..lol no matter where it was made. The yellow meth was sometimes fire and sometimes a liitle "dirty" with chemical residue left more than average. But it was probably Red P, Ephedrine or pseudoepedrine, and hydriotic acid method from california. Or it could have been made somewhere in your state using the Birch method with anhydrous ammonia, ether, lithium or sodium metal and Ephedrine or pseudoepedrine, and was just not washed in acetone to take out the color to make it whiter and purify it..
Ice is easily made from meth powder/rocks aka crank by wahing it in acetone often to take out any cuts or other crap, but this is often skipped. Mostly the powder/crank is dissolved in denatured alcohol and let cryatlize as the denatured alcohol evaporates!! When it has all evaporated the meth is in crystal form, versus powder before, and then sometimes it is put in acetone to "clean it up" if needed.