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c/coa·posted 1 year ago by u/valeria_girard

the COA question that gets asked weekly, answered properly

Question Receipts ×3

Genuinely asking, not being difficult.

Everyone in c/progresspics repeats that area percent is important. I believe it, but I have never seen anyone show why, and when I search I get 6 threads of people agreeing with each other.

Is there a paper? Is there a measurement? Or is this one of those things that is true because it has been repeated since 2023?

I am not trying to be the "source?" guy. I would just like a source.

276 up / 12 down96% upvoted6 commentsid 1uebyy19 Jan 2025

6 comments

6 in this archive, depth 3

best — the order this archive was captured in

u/katrin_girard32 points·1 year 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/valeria_girardOP22 points·1 year ago

purity and net content are two different numbers, same vial

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[removed]9 points·1 year ago

[removed by moderator]

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u/receptor_bias_rick25 points·1 year ago

chromatogram or it did not happen

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u/teodor_lokken12 points·1 year ago

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

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u/purity_pedantanalytical16 points·1 year ago

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

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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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