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Buttermilk: how to tell if spoiled?

I just found out I can freeze leftover buttermilk. I have a carton left over from making scones; my recipe only calls for ½ cup so a lot gets wasted. How long does it generally keep once opened? It seems like yogurt or sour cream keep a long time after opening, does buttermilk do the same?

Can I tell if it is still good enough to freeze by just tasting?

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