People often say that switching to a cup of a different color will change the taste of coffee—drinking from a cup of one color makes it taste sweeter, while switching to another color makes it seem more sour. Is there any basis for this claim? Can the color of a cup really change the flavor of coffee? This article starts with a real test by a friend that Front Street Coffee came into contact with, and discusses the "color-taste synesthesia effect" between color and taste, explaining why cup color cannot directly change coffee taste but can indirectly affect our judgment of flavor, and also discusses whether coffee tasting cups are professional tools or a waste of money. [more…]