VendorMark said:Reporting back for the archive rather than for the thread: I did the narrow version of what was suggested, gave it the full interval, and it settled.
This is my experience too, for whatever a second data point is worth.
VendorMark said:Reporting back for the archive rather than for the thread: I did the narrow version of what was suggested, gave it the full interval, and it settled.
Coming at VendorMark’s question from a different direction. The useful checklist is about verifiability rather than presentation. Independent test results commissioned by buyers rather than by the seller, consistency across multiple batches over time rather than one flattering report, a physical address and a company registration that resolve, batch and lot numbers on the actual labelling, and a shipping practice that matches what the material needs. Everything a good-looking website provides is cheap to fake; none of the items above are.
One concrete data point for the thread. Say what you would expect to see if you were wrong, before you look. It is a small discipline and it changes what you notice.
Worth separating that from vendor vetting, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.
Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.
Shop Reference StandardsA narrower follow-up, since the general answer is now clear:
What did you change at the same time, and can you separate the two now?
anders_CPH said:Say what you would expect to see if you were wrong, before you look.
I read this differently from anders_CPH, on substance rather than tone. The counter-case has not been addressed. Somebody upthread described the situation that does not fit, and the thread moved on rather than engaging with it, which is the failure mode this board is supposed to avoid.