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How to test if your milk is about to go off

I just 'discovered' this morning that there is a way to test if your milk is about to go off even if it still looks, smells and tastes normal, although you know it's pretty old already. If that's the case and you're worried your milk is about to go off, then here's something you can do to see if it actually is close to going off:

Take some of the milk and microwave it for about 30 seconds. If it's actually pretty old then the milk should curdle; if not, you've got yourself a nice cup of warm milk. Alternatively, you can pour some of the said milk into a cup of hot tea or coffee and see the same effect but you'll end up wasting a perfectly good cup of tea or coffee!

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