how do you verify a certificate is actually from the lab it says
#coa-reading 2025-10-31
Friday12 messages4 participantstimes are UTC
Highlights from this day
- HPLC_Hank — i asked SWB for the method and they sent it. that alone put them ahead of most 11:37
- identity_shift — i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does, your mileage will differ 12:57
- HPLC_Hank — a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists 14:47
- lot_number_lou — update from 13 months ago: started asking every supplier for water content and about half now include it, thats one data point 15:27
i asked SWB for the method and they sent it. that alone put them ahead of most
is a supplier certificate worth anything on its own
mixed fonts and inconsistent kerning in one document is worth a second look
nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does, your mileage will differ
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
quick one tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance
ask for water content
[edited]peptidemeter-summary-a-2601.pdf
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update from 13 months ago: started asking every supplier for water content and about half now include it, thats one data point
coming back to this the three way match is vial, certificate, invoice. if all three agree you have something, i think
the paperwork can be perfect and the vial can still be light. weigh it