It’s a temperature thing, but also a timing thing. Milk goes sour fairly quickly if it’s not refrigerated. A cup poured in the morning and allowed to sit for an hour before you drink it will taste drastically different from a cup.poured in the morning and left until evening before you drink it. Curdling or turning sour are gradual processes, and the taste of the milk throughout the course of the day will change gradually as a result.
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