Sure, most people know that red, yellow, and blue are the primary colors; that black is the absence of color, and white is the presence of all colors; that printers use four colors (base colors) to re-create all colors, and black IS a printed color… but can you tell them apart? If so, how well?
Mike Dopp pointed me over to the Color IQ Tester where the lower you score, the better (a perfect score is zero). I scored 11. W00T!