The Alizarol test, due to its simplicity as well as its suitability to point out more than one defect of milk is a practical and well-suited procedure to test raw milk for acceptability. The main objective of the test is to indicate milk in which an unaccepted level of acidity has developed.
It is a pH-indicator since it changes color according to the level of acidity and will thus indicate whether milk is abnormally sour or alkaline.
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