Sourcing · Red flags · continued

Second pass at: Identical chromatograms across two different lots posts 91–94

Sourcing › Red flags disputed mislabelling moderation

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

v.sjobergTL224 Mar 2026#91

k.adeyemi, post #66: Post #64 and I disagree about the size of the effect, not about the direction. My position on Identical chromatograms is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly. Go to post

Everything in post #89 holds. The case it does not cover is the one I have.

Where somebody posts a concern, ask what would resolve it before arguing about it. Half of these threads end with a document nobody had asked for.

The disagreement above is smaller than it looks once the terms are fixed.

3 likes in reply to #66 4mo

so.cardosoTL225 Mar 2026 · edited#92

h.mukherjee, post #46: Worth separating two things that post #42 runs together. Keep the two claims separate. "The result on this lot did not match the certificate" is a report that can be checked. "This supplier is dishonest" is an allegation about intent and nothing in a chromatogram supports it. The claim is narrower than it sounds, and deliberately so. Go to post

Identical chromatograms has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.

0 likes in reply to #46 4mo

s.dziedzicTL225 Mar 2026#93

A document with no method identification is not evidence of anything wrong. It is evidence that the document cannot be checked, which is a different and weaker statement.

31 likes 4mo

b.nilsenTL225 Mar 2026#94

Building on post #93 rather than restating it.

The claim about Identical chromatograms upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".

16 likes 4mo

This topic was referenced in

Distinguishing a red flag from an inconvenienceSourcing › Red flags · 2 replies

Moved from Logistics by bench_notes. Category placement is not obvious from outside and getting it wrong is expected. This topic will get better answers here. The move is recorded in the public log citing R7.

Suggested topics

Topic	Participants	Replies	Views	Activity
Coming back to: Pricing far outside the range, in either direction Sourcing › Red flags documentation quality underdosing mislabelling Pricing far outside the range, in either direction Writing it up because I had to work it out twice and would rather nobody else did. Pricing far outside the range — I have the observation and I do not trust…	+22	26	325	2y
Batch numbers that do not match the vial label Sourcing › Red flags mislabelling disputed moderation underdosing Solved Batch numbers that do not match the vial label — setting out what I have, and where I think it stops being reliable. Structured question about turnaround and what it signals. I have started recording how long…	+43	48	8.9k	2d
Patterns that reliably precede a problem, documented Sourcing › Red flags documentation quality disputed mislabelling underdosing Patterns that reliably precede a problem, documented — setting out what I have, and where I think it stops being reliable. Patterns, from the point of view of someone who has read the documentation and is…	+3	7	31k	16mo
Pricing far outside the range, in either direction Sourcing › Red flags disputed mislabelling underdosing moderation Solved Posting this under the heading it deserves: Pricing far outside the range, in either direction Everything below is what sits behind that. A question about pricing far outside the range that I think has a…	+3	7	27k	7mo
A supplier who responds to a discrepancy with silence Sourcing › Red flags underdosing documentation quality moderation mislabelling Closed On the subject in the title: A supplier who responds to a discrepancy with silence Working notes rather than a conclusion. Two things I would like separated before anyone answers on supplier, because they get…		2	6.1k	16mo

Related topics — sharing the tags disputed, mislabelling, moderation

Topic	Participants	Replies	Views	Activity
Compounds this community declines to help with, and why — does this still hold? Compounds › Other compounds custom synthesis research use only mislabelling Compounds this community declines to help with, and why — does this still hold? — that is the question, and I have not found it answered plainly anywhere I have looked. Putting the numbers in the first post,…	+3	7	26k	7h
Why catalogue breadth is not evidence of anything — what changed since Compounds › Other compounds custom synthesis mislabelling needs a source research use only Asking directly, because I could not find a straight answer: Why catalogue breadth is not evidence of anything — what changed since What changes if the standard account of catalogue breadth is wrong? I ask…	+62	66	26k	10mo
About the Red flags category Sourcing › Red flags mislabelling underdosing documentation quality Pinned Wiki Closed Patterns that reliably precede a problem. Documented, dated, and free of accusation without evidence. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is…		4	57k	17mo
Batch numbers that do not match the vial label — what changed since Sourcing › Red flags underdosing documentation quality disputed moderation Solved On the subject in the title: Batch numbers that do not match the vial label — what changed since Working notes rather than a conclusion. What changes if the standard account of Batch numbers is wrong? I ask…	+39	43	14k	1mo
About the Site feedback category Meta › Site feedback site feedback moderation guidelines Pinned Wiki Closed Bugs, friction, and the parts of the site that do not work the way you expected. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with its author and…		4	54k	10mo