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

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

COA Receipts ×4 Long Haul ×2 Well Actually ×2

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 showed up at week 39, not week 88. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

3,764 up / 95 down98% upvoted44 commentsid zfeuwh30 Jan 2026

44 comments

20 in this archive, depth 4

best — the order this archive was captured in

u/coa_janitorMOD526 points·5 months ago

Tracking number removed. It identifies both ends of a shipment.

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u/tidy_vialdrawer_plsOP423 points·5 months ago

What is the method line say? Not the technique, the actual method.

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u/hugo_bergstrom-11 points·6 months ago

Crossposting this to c/sideeffects because the people who need it are not reading this community.

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u/marisol_frisk300 points·6 months ago

post the whole document, not the headline number

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u/dario_vermeulen384 points·6 months ago

I am going to push back on this slightly.

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u/tidy_vialdrawer_plsOP234 points·6 months ago

I am going to push back on this slightly.

Yes, exactly this, and it is the bit that took me 9 weeks to accept.

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u/teodor_jansen150 points·6 months ago
yep. 15 weeks in, same.
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u/teodor_lokken110 points·6 months ago

the related substances line is where the story is

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u/ghrp_history34 points·6 months ago·edited

the related substances line is where the story is

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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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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u/laila_yilmaz106 points·6 months ago

the batch number or it did not happen

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u/priya_palacios49 points·5 months ago·edited

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/marisol_frisk58 points·5 months ago

post the whole document, not the headline number

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u/neha_erdogan0 points·5 months ago

chromatogram or it did not happen

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u/stablecoin_steve0 points·5 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/vito_chowdhury1 point·5 months ago·edited

the counterion is part of the mass you paid for

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u/tidy_vialdrawer_plsOP1 point·5 months ago

Respectfully this is a sample of one presented as a finding.

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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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