1. A color chart displaying a plurality of coordinated distinct colors, each coordinated color on said chart being obtained by utilizing specific amounts of each of only independently variable, constant tint density colorants yellow, magenta, and cyan, and being represented by a specific point in a plane disposed perpendicular to a line drawn between one point and another point diagonally opposite thereto within the space of a color cube on which said colorants are arranged along three mutually perpendicular edges of said cube mutually intersecting at said one point, one of said colorants corresponding to each edge with the amount of each colorant uniformly and progressively increasing along its respective edge from a minimum at said one point to a maximum at corresponding cube corners, and wherein there is associated with each said specific point on said plane a unique combination of amounts of each said colorants which is characterized by a constant tint density.