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I bought some milk today on a special offer, its expiration date being tomorrow, and after leaving it outside, in one of the still-sealed boxes, for a few hours, the milk went bitter.

But milk always changes to a sour taste when it expires, not bitter, or so I thought. Someone told me that there might be powdered milk inside, and that would spell trouble for the store.

More information about this is welcome.

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closed as unclear what you're asking by Rory M Jul 23 at 12:56

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Could you explain the difference between sour and bitter? –  Rory M Jul 23 at 12:57

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