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Agreed, natural variation is possible but I haven't seen white or yellow enough to form a solid opinion, and I am no stranger to that what Dragonrevolt is stating. I don't understand things sellers say, perhaps he ( you) can help others like figure it out. I have been offered a "new" yellow adb-b, said to produce stronger final product. I feel I'm allowed to ask what is the different new final product, but it's allegedly stronger, although the same, final product. I insist on some explanation, possibly optical, chiral any form of isolated isomer, excluded the hypothesis that this would be a 5Br derivative, yet they assure its the very same so something spooky is really being pushed, unless we accept that one is less pure than the other, or maybe the other is more pure than the less pure kind. Or is it not the opposite of the contrary? When presented by the abundant lack of evidence, I'm forced to to plea guilty of second degree total confusion. Similar frivolous talks of a new, better pmk ethyl glycidate powder (not waxy/oily) raise suspicions and soon become an issue of interest and maybe a suspect or co-conspirator, but this is not official. Same cas & different freezing point? This demans an explanation. One can only conclude either adulterants are now not added or impurities are now adequately removed. Unfounded allegations and evidence beyond reasonable explanation weakens the investigation and with no further leads, the case became cold. Dragonrevolt, how do you responsibly explain the difference between yellow and white adb-b or adb-b related substances or events narrated in this discussion? Surely someone will be interested in your business if you show you offer more than catchy but empty words. And I'm not saying that beyond color there is a difference or that there's not. I'd be seriously and positively surprised if a decent, detailed and methodologically grounded explanation brought light to the table.