The answer is in the color! It should be creamy and white at first glance, not yellowish. You should also look at the separated liquid -- what color is it? Watery is good, yellowish is not. The sniff test also applies here. A tangy aroma is normal, but a strong or musky odor most definitely is not. Obviously, mold growth is a definite sign of spoilage. And, as always, when in doubt, throw it out!

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