#coa-reading 2025-11-02

coming back after 14 months, has the pinned reading guide changed

single wavelength detection can miss a co-eluting impurity that does not absorb there

a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists

i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019, i could be wrong

if you only read one line on a certificate, read the lot number. if you read two, read the assay

certificate is dated before the lot date, is that just sloppiness

tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance, anyway

not evidence on its own

thats a real table

looks re-dated

a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully

genuine question nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself