thats a tell
#coa-reading 2025-06-09
Monday13 messages5 participantstimes are UTC
Highlights from this day
- wrong_network — a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists 18:45
- seven_five_sweet — sterility and endotoxin are separate tests and almost nobody runs either on research material 19:16
- area_percent — a certificate should name the method, the instrument, the column and the operator. most name none of those 19:28
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
the three way match is vial, certificate, invoice. if all three agree you have something
no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgsterility and endotoxin are separate tests and almost nobody runs either on research material
👀15😂2
two certificates from the same supplier have an identical chromatogram, is that normal
a certificate should name the method, the instrument, the column and the operator. most name none of those
update from 14 months ago: started asking every supplier for water content and about half now include it
good certificate actually
should a certificate say which instrument and method they used
ask for water content
the related substances table is the interesting part. a row of "not detected" means they did not look hard