Sour is one of four basic sapidPleasant 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... (in the mouth) tastes: Sour, Sweet, SaltySalty 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..., BitterBitterness 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... (and possibly a 5th called UmamiUmami 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,... 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 acidityAcidity 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..., which is usually a favorable characteristic.