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History and Origins of Foods

Why does milk sour in the absence of refrigeration?


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Answered 2011-01-21 19:09:08

The bacteria which lay dormant in a chilled environment (4 - 1 degree c) reproduce at a high rate when the milks ambient temperature increases. This bacteria makes the milk sour. In recent years improved methods of destroying these trace bacteria have been undertaken which has allowed milk to stay fresher longer under correct refrigeration

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