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c/coa·submitted 6 months ago by u/tidy_vialdrawer_pls

certificate of analysis — my 17-week log, condensed into one table

COAbranch of 4 comments

Right, the batch question again, but with numbers this time. I have 15 data points over 4 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 effect I am describing…

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4 comments, started 6 months ago
u/freya_baptista139 points·6 months ago
genuinely useful, thanks
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u/rohan_steiner49 points·6 months ago

the batch number or it did not happen

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u/coa_janitormod · c/coa11 points·5 months ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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u/tidy_vialdrawer_watch4 points·5 months ago

axis labels included, always

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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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