how much of what we believe about batch actually comes from purity threads
Slightly embarrassed to be asking this, but: how much of what we believe about batch actually comes from purity threads. Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently. Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label…
My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.
batch number, date of analysis, method, individual impurities — that is the minimum set
batch number, date of analysis, method, individual impurities — that is the minimum set
Agreed, and the practical version is: ask for the itemised table. If it exists, you get it.
the counterion is part of the mass you paid for
The PDF creation date being later than the analysis date is usually a re-issue or a re-export. It is worth one question and it is not evidence of anything on its own.
Is water content on the document? It changes your concentration arithmetic.
Started keeping a folder of every certificate I have been sent. The ones that itemise impurities are a small group and they are mostly the same suppliers.