gross mass on a jewellery scale plus the water content is enough to catch most underfills
Thread · #coa-reading · 2026-04-11
is there a reason a certificate would omit
Spun off from a message in #coa-reading on 2026-04-11. 12 messages, 5 participants.
The message this came from
- tallinn_taper — is there a reason a certificate would omit the water content deliberately, sorry if thats been covered — and the retention time on this one is different from the last lot, problem 23:20
small thing on the impurity table i ask for the batch record rather than the certificate now, because the record is harder to make up
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worth noticing
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists, the wavelength matters here
lot specific not batch
i have never seen a research certificate with an endotoxin result on it. not once
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update from 3 months ago: started asking every supplier for water content and about half now include it, not detected means the limit
the table not the headline
a jpeg of a certificate is not automatically fake and it is automatically harder to check
same_chromatoa supplier certificate on its own is a starting point, not evidence. that is the whole…
evening, ask for water content
net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
anyone got a certificate they would hold up as the example of how to do it, if anyone has a number
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