if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
#coa-reading 2026-02-02
Monday12 messages4 participantstimes are UTC
Highlights from this day
- bac_water_bill — if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not 18:10
- cold_start_cy — residual solvents matter more than people think for anything that went through a lot of purification steps 18:23
- cold_start_cy — update on the earlier thing my 2mg vial weighed more than 10mg of powder, is the certificate lying 19:13
- ms_ms_mira — i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019 20:31
- ms_ms_mira — coming back to this the retention time on this one is different from the last lot, problem 20:32
residual solvents matter more than people think for anything that went through a lot of purification steps
is water content normally on a certificate or do you have to ask
certificate is dated before the lot date, is that just sloppiness
thats a tell
update on the earlier thing my 2mg vial weighed more than 10mg of powder, is the certificate lying
[edited]purity is not assay
an identical chromatogram on two different lots is the single biggest tell there is
i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019
coming back to this the retention time on this one is different from the last lot, problem
net not gross
why would a vial be 98.1 pure and still assay under label