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c/coa·submitted 2 months ago by u/ismael_eriksen

reading area percent threads from 2024 and half of it aged badly

Explainerbranch of 6 comments

I have had 14 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 10 days on nominally the same lane, which matters more in summer than in February. The independent number came back 99.0% against a claimed…

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6 comments, started 2 months ago
u/aleksi_eriksen135 points·2 months ago

the related substances line is where the story is

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u/tomas_lehtinen91 points·2 months ago

Cosigning. The batch number is load-bearing information.

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u/ismael_eriksenOP52 points·2 months ago

The chromatogram trace is where the real information lives. The summary number is just a headline.

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u/vito_chowdhury-7 points·2 months ago

post the whole document, not the headline number

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u/nabila_espinoza1 point·2 months ago·edited

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/spreadsheet_gremlindata1 point·2 months ago·edited

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

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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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