- Fat and solids
- Measured on a milk analyser. Low numbers are how watered or skimmed milk gives itself away.
- Added water
- Freezing-point test. Water changes the point at which milk freezes, and no amount of skill hides it.
- Antibiotics
- A rapid strip test on every batch. A treated cow is milked apart and her milk never reaches a bottle.
- Aflatoxin M1
- Comes from mouldy feed. We grow and dry our own fodder and test weekly, below the strictest limit.
- Plate count
- How clean the milking and chilling were. Cold within 23 minutes keeps it low without adding anything.
- Temperature
- Logged at dispatch. If a crate leaves above 4 °C, it comes back.