Sour is one of four basic sapid (in the mouth) tastes: Sour, Sweet, Salty, Bitter (and possibly a 5th called Umami which indicates savory flavors). In coffee, sourness in moderate amounts of favorable, although the term has negative connotations. Sourness can result from too-light roasts, which have a corresponding bitterness. It can also be the result of acidity, which is usually a favorable characteristic.

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