thats the counterion
[edited]🧊4
#coa-reading 2025-10-30
Thursday13 messages4 participantstimes are UTC
Highlights from this day
- peak_split — if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not 23:06
- shame_and_meds — the three way match is vial, certificate, invoice. if all three agree you have something 23:08
- peak_split — i asked GGPeps for the method and they sent it. that alone put them ahead of most 23:22
purity is not assay
residual solvents matter more than people think for anything that went through a lot of purification steps
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test, thats just me
how do you verify a certificate is actually from the lab it says
sterility and endotoxin are separate tests and almost nobody runs either on research material
does anyone keep a folder of certificates to compare over time
an identical chromatogram on two different lots is the single biggest tell there is, happy to be corrected
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thats a tell
if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
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the three way match is vial, certificate, invoice. if all three agree you have something
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coming back after 6 months, has the pinned reading guide changed
swirl_not_shakesterility and endotoxin are separate tests and almost nobody runs either on research…
i asked GGPeps for the method and they sent it. that alone put them ahead of most