It depends where the lab got their powders from. Back in the early days of the boards, many got their from one major maker of these powders. Sinsert then, many half ass companies popped up in that same country. Their quality control wasn't as strict as the first company.
So instead of getting powders that were 99% pure. Getting powders from these other places with sloppy quality control, that almost pure number turned into 91% .
Some underground labs never had those powders tested. Never thought they needed to.
Or so I was told
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