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c/coa·submitted 1 year ago by u/clara_danquah

certificate of analysis: the version I wish someone had shown me in week 1

Labbranch of 5 comments

Right, the certificate of analysis question again, but with numbers this time. I have 20 data points over 32 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign. The thing I would flag for anyone new: the…

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5 comments, started 1 year ago
u/wrong_network_w366 points·1 year ago

post the whole document, not the headline number

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u/nabila_espinoza131 points·1 year ago

The confident tone is doing a lot of work that the evidence is not.

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u/sofia_danquah94 points·1 year ago

The confident tone is doing a lot of work that the evidence is not.

Yes, exactly this, and it is the bit that took me 49 weeks to accept.

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u/andres_restrepo43 points·1 year ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/clara_danquahOP66 points·1 year ago

the batch number or it did not happen

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About c/coa

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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