Method · 2026-11-13
What a purity figure can and cannot prove
A percentage on a report looks like a verdict. It is a measurement, made by a method, on a sample. The difference matters when the number is the only thing you have.
Field notes
Notes on the quiet parts of sourcing
Longer pieces about records, lots and what a supplier can show you. Written for research buyers and bench scientists; the guidance that ships with each batch always takes precedence.
Method · 2026-11-06
Comparing two lots without running a full study
A second lot arrives and the question is whether it behaves like the first. The comparison does not need to be a study; it needs to be small, same-day, and written down before it starts.
Records · 2026-10-30
What a vial label can tell you, and what it cannot
The label is the smallest document that travels with a lot, and the one most often read in a hurry. A note on the fields that matter, the ones that mislead, and the habit that keeps both visible.