does anyone keep a folder of certificates to compare over time
#coa-reading 2025-11-12
Wednesday19 messages4 participantstimes are UTC
Highlights from this day
- deamidation — a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully 19:49
- retention_time — unrelated but gross mass on a jewellery scale plus the water content is enough to catch most underfills sterility and endotoxin are separate tests and almost nobody… 20:14
- retention_time — why would a vial be 96.8 pure and still assay under label 21:02
- acetate_ash — genuine question does anyone actually check the residual solvents section 21:10
my 40mg vial weighed more than 10mg of powder, is the certificate lying
for the archive is there a standard layout or does every lab do their own
purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions
retention time shifts between runs are normal. relative retention time is the number to compare
is water content normally on a certificate or do you have to ask
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
the related substances table is the interesting part. a row of "not detected" means they did not look hard
certificate is dated before the lot date, is that just sloppiness
coming back after 24 months, has the pinned reading guide changed
a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully
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nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
the three way match is vial, certificate, invoice. if all three agree you have something
unrelated but gross mass on a jewellery scale plus the water content is enough to catch most underfills
sterility and endotoxin are separate tests and almost nobody runs either on research material
mixed fonts and inconsistent kerning in one document is worth a second look
if you only read one line on a certificate, read the lot number. if you read two, read the assay
i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does
why would a vial be 96.8 pure and still assay under label
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genuine question does anyone actually check the residual solvents section
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