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c/coa·posted 1 months ago by u/ahmed_rasmussen

[Question] Poland — has anyone got a straight answer on related substances

Question Cold Box ×7

Genuinely asking, not being difficult.

Everyone in c/progresspics repeats that water content 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.

532 up / 191 down74% upvoted10 commentsid hawlm13 Jun 2026

10 comments

6 in this archive, depth 3

best — the order this archive was captured in

u/tidy_vialdrawer_watch0 points·1 months ago

Every time this gets posted it hits the front page and every time someone has to re-explain it.

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u/stablecoin_steve36 points·1 months ago

Cosigning. The batch number is load-bearing information.

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u/receptor_bias_rick28 points·1 months ago

area% is not mass%, and here is exactly why it matters

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[removed]18 points·1 months ago

[removed by moderator]

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u/anecdata_annie12 points·1 months ago

Cosigning.

Yes, exactly this, and it is the bit that took me 62 weeks to accept.

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u/ahmed_rasmussenOP5 points·1 months ago

post the whole document, not the headline number

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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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