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c/coa·submitted 7 months ago by u/sofia_ferreira

anyone else notice water content kicking in around week 39

Explainerbranch of 5 comments

I have had 20 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 24 days on nominally the same lane, which matters more in summer than in February. The independent number came back 98.4% against a claimed…

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5 comments, started 7 months ago
u/bastian_moreau42 points·7 months ago

Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to WWB.

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u/nadia_kjaer27 points·7 months ago

Batch number and date of analysis? Both are load-bearing.

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u/sofia_ferreiraOP0 points·7 months ago

purity and net content are two different numbers, same vial

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u/mikkel_correia1 point·7 months ago·edited

post the whole document, not the headline number

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u/zeynep_zielinski12 points·7 months ago

Did they give you the chromatogram or just the summary line?

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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