Sour is one of four basic Pleasant tastes, referring to tactile sensation derived from the basic flavors: salty, sweet, sour, bitter, savory (umami). In a broader sense, sapid means "pleasing to the mind", referring to the intersection between pleasant sensory input More (in the mouth) tastes: Sour, Sweet, Salty 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, saltiness is not usually a positive quality, but More, Bitterness is one of 5 basic tastes: Sour, Sweet, Salty, Bitter and Umami (savory flavors). There are many types of bitterness, hence not one avenue to tracking down its source. Bitterness as a positive quality More (and possibly a 5th called Umami is a Japanese word that has been adopted to indicate savory flavor and scent, and is considered by some as the 5th core flavor along with sour, salty, sweet, and bitter.: Umami is a More 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 is a positive flavor attribute in coffee, also referred to as brightness or liveliness. It adds a brilliance to the cup, whereas low acid coffees can seem flat. Acidity can sound unattractive. People may More, which is usually a favorable characteristic.