follow up nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
#coa-reading 2026-03-23
Monday16 messages3 participantstimes are UTC
Highlights from this day
- two_four_ceiling — i asked TFC for the method and they sent it. that alone put them ahead of most, ymmv 19:41
- two_four_ceiling — the honest summary is that a certificate tells you what the supplier says about a lot they chose to test 20:01
- bac_water_bill — the certificate from HJ is the one i use to teach this because it actually has a populated impurity table 21:23
is a supplier certificate worth anything on its own
does anyone keep a folder of certificates to compare over time
thats the counterion
sloppy not sinister
i asked TFC for the method and they sent it. that alone put them ahead of most, ymmv
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if you only read one line on a certificate, read the lot number. if you read two, read the assay
test it yourself
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the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
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same chromatogram
unrelated but sterility and endotoxin are separate tests and almost nobody runs either on research material
slightly off topic but the retention time on this one is different from the last lot, problem
*Medutest not the other one
not detected means nothing
[edited]the certificate from HJ is the one i use to teach this because it actually has a populated impurity table
the paperwork can be perfect and the vial can still be light. weigh it