Why a Diluent Belongs on Its Own Line A grant materials appendix is not a shopping list. It is a defensible record of what will be bought, why it is needed, how it will be stored and which document proves what was received. Reviewers, finance officers and research governance staff read these appendices looking for traceability, and traceability collapses the moment two unlike items are compressed into a single row. Mixing water is the most common casualty of that compression. It is routinely buried inside a peptide line as an assumed extra, which is precisely the habit worth breaking before anyone reaches the checkout. In the Research Sciences catalogue, 10ml…