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c/coa·submitted 2 years ago by u/zeynep_zielinski

the batch question that gets asked weekly, answered properly

Suspiciousbranch of 8 comments

Something I noticed reading old threads that I have not seen said out loud. The advice on COA in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the…

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8 comments, started 2 years ago
u/zaid_balogun561 points·2 years ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/zeynep_zielinskiOP324 points·2 years ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

Yes, exactly this, and it is the bit that took me 8 weeks to accept.

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u/sunday_shot_sal225 points·2 years ago

Cosigning. The batch number is load-bearing information.

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u/nadia_fonseca153 points·2 years ago·edited

the batch number or it did not happen

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u/reflux_report191 points·2 years ago

the counterion is part of the mass you paid for

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u/soren_nkemelu382 points·2 years ago

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

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u/emeka_beaulieu-4 points·2 years 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/amylin_amyamylin185 points·2 years ago

no "is this good?" without saying what the compound and claimed purity are

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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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