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c/coa·submitted 1 year ago by u/neha_erdogan

[Discussion] the purity advice in here is 9 years out of date

Discussionbranch of 5 comments

Posting this because I searched for it and got nothing useful. Setup: 1.7mg, week 52, sulphur burps present but not ruining anything. I changed exactly one variable — COA — and tracked it for 9 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am…

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5 comments, started 1 year ago
u/cato_achebe0 points·1 year ago
source?
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u/alcohol_aversion1 point·1 year ago

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

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u/neha_erdoganOP1 point·1 year ago

Strongly agree.

Adding to this: area percent is doing more work than the comment implies.

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u/neha_erdoganOP1 point·1 year ago

Asked QSC for the batch-specific COA and they sent it within six hours, full document, batch number, date, everything. That is the baseline.

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u/isabela_nilsen0 points·1 year ago

Cosigning. The batch number is load-bearing information.

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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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