From the other side of the consultation, briefly. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.
The figures, for anyone assembling their own picture. One habit that pays for itself: post the method alongside the number. A figure without its method cannot be checked, and an unchecked figure is how this community accumulates folklore.
Worth separating that from certificates of analysis, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.
Correct me if the detail matters more than I have assumed.
One thing that is still open after DanielChem_CHI’s answer:
Why two laboratories report different purity for the same batch, and which number to believe?
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Shop Reference StandardsVendorMark said:One habit that pays for itself: post the method alongside the number.
I read this differently from VendorMark, on substance rather than tone. Pushing back on the consensus forming here. Consistency is not the same as correctness, and a board that agrees with itself quickly is usually agreeing with the first person who sounded certain.
Moderator note: leaving this open. It is being argued well and the disagreement is the useful part. Thread quality here is what the rules are for. Keep it up.