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Acetic acid, or more commonly known as vinegar, is one of the many organic acids that play an important role in coffee quality. Although, there are varying levels found in both dry and wet processed coffees, its formation during post harvest processing comes primarily from fermentation.   

Like many living organisms, citric acid plays an important role as a key intermediate compound in the plant's metabolic cycle. In green coffee citric acid makes up a significant portion of coffee's total acid content and ultimately in the development of perceived acidity.