the batch question that gets asked weekly, answered properly
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 same confidence.
I have listed what I think the current consensus is below. Correct me — that is the point of posting it.
best — the order this archive was captured in
Batch number and date of analysis? Both are load-bearing.
This is the correct framing. The COA structure matters as much as the number.
Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to JEEP.
Sent one vial to PeptideMeter and VendorInvestigate. 93.7% and 99.0%. Cost me more than the vial did and I would do it again.
Sent one vial to PeptideMeter and VendorInvestigate.
Adding to this: batch is doing more work than the comment implies.
Water content on the document? That affects your concentration math.
Disagree but this is the good kind of wrong — it is specific enough to be checked.
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.
Cosigning. The batch number is load-bearing information.
the batch number or it did not happen
the counterion is part of the mass you paid for
Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.
No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.
no "is this good?" without saying what the compound and claimed purity are
The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.
The COA I was holding said 96.8% area and I thought it was trash. Turns out the method was solid and the impurity profile was clean.
area% is not mass%, and here is exactly why it matters
Not convinced. The evidence does not support that reading.
the counterion is part of the mass you paid for
Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.
- 1Disagree but this is the good kind of wrong — it is specific enough to be…8 comments in this branch · started by u/zaid_balogun
- 2This is the correct framing. The COA structure matters as much as the number.7 comments in this branch · started by u/ahmed_rasmussen