follow up is area percent the same thing as how many mg are in the vial
#coa-reading 2026-04-12
Sunday20 messages5 participantstimes are UTC
Highlights from this day
- red_flag_ruby — one decimal versus two is usually just house style, not precision 16:37
- VialBot — Verification log updated: FGP — evidence added, status unchanged. 16:41
- ivy_injects — coming back after 12 months, has the pinned reading guide changed 17:17
- karl_fischer — certificate is dated before the lot date, is that just sloppiness net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a… 18:22
one decimal versus two is usually just house style, not precision
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i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does
unrelated but water content is why an honest 10mg vial assays at 9.1. karl fischer titration, and most certificates omit it
Verification log updated: FGP — evidence added, status unchanged.
thats the counterion
mixed fonts and inconsistent kerning in one document is worth a second look
a vial can be 99.4% pure and hold 8.1mg of a 10mg label. both numbers are true and only one of them is the one you care about
the paperwork can be perfect and the vial can still be light. weigh it
nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
single wavelength detection can miss a co-eluting impurity that does not absorb there
a vial can be 99.4% pure and hold 8.1mg of a 10mg label. both numbers are true and only one of them is the one you care about
thats a real table
coming back after 12 months, has the pinned reading guide changed
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the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
whats the minimum a certificate has to have before you take it seriously
sterility and endotoxin are separate tests and almost nobody runs either on research material
certificate is dated before the lot date, is that just sloppiness
net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
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quick one whats the related substances table actually telling me
is sterility tested as part of a normal purity certificate
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the retention time on this one is different from the last lot, problem