Identical chromatograms across two different lots

Identical chromatograms across two different lots Writing it up because I had to work it out twice and would rather nobody else did.

Collecting what is known about identical chromatograms in one place, because it is currently spread across a category, two tag pages and a thread that is hard to find.

This is a summary rather than new work, and I have attributed each part to where I found it.

Clear enough that I do not think I have a follow-up, which is unusual.

The confident answers on identical chromatograms and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this category.

Post #17 describes the usual case. This is about the unusual one.

I would call the community position on identical chromatograms likely rather than established, and I would be comfortable defending that hedge.

Post #54 is right about the mechanism and I think understates the practical bit.

Prices well below the rest of the market are a fact rather than a finding. They are worth noting and they do not establish anything on their own.

Posted with less confidence than the sentence structure implies.

Agreed, and I will stop repeating the version of this I had been repeating.

Offering a way to settle identical chromatograms rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within the noise, the question was not answerable at this precision.

Counterpoint on identical chromatograms, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one out.

Quietly grateful for the plain phrasing. Not every thread gets that.