... 40 drops of rezazurin in the mixture in order to avoid spillages. I will set up a test-tube rack with six empty test-tubes. On the first day, i.e. the day that I start the investigation, I will use a measuring cylinder to measure out 8cm3 of milk that will be fresh on that day. I will then measure the pH of this fresh milk using the pH meter to take the pH. I will make a note of this pH and determine whether it is an acidic, neutral or an alkaline solution. After I have done this, I will use a pipette to carefully add forty drops of rezazurin to the test-tube. The rezazurin acts as a universal indicator and determines the rough pH. I will shake this mixture and stir it with the pipette. I will then put this test-tube back into the test-tube rack before labelling it ...

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