gross mass on a jewellery scale plus the water content is enough to catch most underfills
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Thread · #coa-reading · 2026-05-24
single wavelength detection can miss a co-eluting impurity that
Spun off from a message in #coa-reading on 2026-05-24. 12 messages, 3 participants.
The message this came from
- pharmac_pen — single wavelength detection can miss a co-eluting impurity that does not absorb there, your mileage will differ 23:21
coming back after 17 months, has the pinned reading guide changed
same chromatogram
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
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good certificate actually
certificate is dated before the lot date, is that just sloppiness
does anyone actually check the residual solvents section
gross mass on a jewellery scale plus the water content is enough to catch most underfills
good certificate actually
purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions
if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not