Seconded - Hats off to you kind sir hope to see more posts from you around here
You're welcome. I believe the world's a better place when information is shared.
The widespread conjecture that the "tan" mdpv was simply a less pure version of pv, might in fact be true. The freebase process I described might create any number of impurities. I don't know for sure. But if it is true, then it might be those very impurities that provide this awesome high. After all, the euphoric element of white pv (what little there is), lasts about an hour and a half at best. The tan pv euphoria, which is indescribably awesome, lasts 5 to 6 hours. The white pv has limited prosexual qualities. The tan pv is hypersexual to the extreme - even to the point of being labeled "perv powder" by many of its users. The white pv has a horrific comedown. The tan pv has no noticeable comedown. A 100 mg single dose of the white will keep you up for 3 days and create paranoia, depression, lethargy, confusion and a host of other negative and dangerous side effects. A 100 mg dose of the tan will merely guarantee fatigue and sore genitals from non-stop sex and keep you up for 24 hours max. And you would, quite seriously, run a danger of getting arrested for indecent behavior or molestation if you go out in public after such a dose. (not recommended to wander around in public unattended after an excessive dose of tan pv by the way). The white pv creates a strung-out, edgy feeling in moderately large doses. The tan creates a smooth hum. If you observe people who are on the white pv, there are few smiles after the first hour and a half. People on the tan pv can't get the smile off of their faces for the full 6 hours - this is a true observation. The white pv creates a highly elevated heartbeat in any dose above 20 mg. The tan pv creates only a slightly elevated heartbeat at similar doses. White pv suppresses appetite. Tan pv, after a few of days of use, increases appetite enormously. It's nearly impossible to sleep after large doses of the white without massive ingestion of one of more CNS depressants. After the eight hour ride of the tan, most people can sleep like a baby (but you of course can't sleep while the tan is "on" during that eight hours). The only similarities are dosage -- 3mg is more than sufficient for most people for both forms, and a tendency to fiending for both forms. It's hard to avoid re-dosing with both forms - which, given the potency of both, is highly dangerous - more so with the white, I feel, because of the psychological stresses incurred at high doses.
From a physical standpoint, the two forms are radically different. The HCL is snow white, the freebased is tan to dark brown. The HCl is a fine powder. The tan is clumpy. The Initial oil (pure methylenedioxypyrovalerone) is greenish yellow and lighter than water. This oil, in water an air, over time, turns dark yellow and becomes heavier than water.
So maybe there is an impurity that gets into the tan pv during the detailed freebasing process I've described throughout this thread, while simultaneously destroying most of the the original mdpv by cleaving off a carbon atom or something. I really don't have a clue.
What I've tried to do is provide as much information as I can to those who are interested in the mystery of the white/tan, while adhering to the rules of this forum. Not an easy task, but I hope I've succeeded to some small degree for those people who read between the lines and sit back and think about this for a while.
As an aside, one thing I was hoping for as a result of these posts was to find someone on this board who might help me determine whether there is an "impurity" getting into this freebasing process, and what that impurity might exactly be. I am not a chemist, but I do desperately need help from some clever and motivated chemist here. I am more than happy to pay for someone's time and efforts. And it might be an intellectually rewarding pursuit for someone.
To make it easier to analyse, I've returned the stuff to the salt version (mdpv? acetate - I don't like fucking with hydrochloric acid to get the hcl). I haven't mentioned it before because an effective dose appears to be less than 0.25 milligrams, and it's impossible to safely bump it without very expensive scales. I didn't want anyone to try it and hurt themselves. But someone would have done it anyway, I finally figured, so better to mention the safety issue up front. Returning it to the salt using Acetic Acid left a huge residual, which tells me that the process I described early in this thread produces a very impure substance, which is just as well from a safety standpoint. The residual seems totally inert, so it does not seem to have impacted the effects at all. There is zero difference in effect between the end product earlier described and the mdpv? acetate, other than dosage. The fact that dosage appears to be one tenth of white mdpv suggests that maybe some radical change did in fact take place at one or more steps in the freebasing process. The color of the pure acetate is also very tan as you can see. It was precipitated from a clear (no particulates), slightly yellow solution by simple evaporation using a fan: