The test paper allows the quick and easy detection of the pH of milk. It is used as a screening test on mastitis. Milk of infected cattle must not be sold.

• Colour change: Yellow-green to blue

All four tits of the udder require testing. A drop of milk is placed on the test zone. For healthy cows the color turns to yellow-red (pH 6,4 to 6,6).

A green (pH 7) or blue (pH 8) colour indicates mastitis. If the indicator remains yellow, the pH of the milk is about 6,3. This finding is likewise pathological and requires further diagnostic or therapeutic action.