What makes coffee bitter?
A. Coffee is a complex chemical soup, and many of its chemicals, including some that produce astringency rather than bitterness, and even some acids, have been implicated in the perception of bitterness.
Bitterness also depends on variables including the coffee variety; how it is processed and roasted; the brewing method, temperature and time; and even the chemical content of the water.
Read: What makes coffee bitter?
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