Many people drink black coffee, and after drinking it, they will find that the coffee becomes more and more sour. In fact, because the coffee bean itself is a kind of fruit, it is rich in tannin. When the temperature of the coffee drops, the tannic acid is released, and when the temperature is lower, the human taste is more obvious to the sour taste. So we will obviously feel that the coffee has obviously become sour after cooling. Of course, only good beans don't have much difference in flavor between hot and cold.
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