Re: Sour milk!
You wouldn't leave fresh milk in the fridge for 2 months, because bacteria would make it spoil before the lipase made it taste yucky. But putting your milk in the freezer for a couple months spares it from bacterial action, preserving it long enough for lipase to slowly and steadily break down all the fats.
The enzyme can work so slowly on frozen milk that that is why you don't have a problem with fresh. And I bet milk you froze last week is OK.
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