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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 9 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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9 comments, started 1 year ago
u/anders_kuusela-14 points·1 year ago

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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[removed]1 point·1 year ago

[removed by moderator]

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u/dario_vermeulen1 point·1 year ago

purity and net content are two different numbers, same vial

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u/clara_danquahOP1 point·1 year ago

the method line is doing real work, not just window dressing

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u/stablecoin_steve1 point·1 year ago

axis labels included, always

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u/rania_okonkwo1 point·1 year ago

purity and net content are two different numbers, same vial

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u/rohan_steiner1 point·1 year ago·edited

This is the correct framing. The COA structure matters as much as the number.

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u/clara_danquahOP1 point·1 year ago

redact your own name, not the vendor's batch details

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u/valeria_karlsen1 point·1 year ago·edited

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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  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
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