An article is printed based upon predetermined artwork. The artwork includes the specification of a palette of ink colors to be used in printing the article. Each of the colors is specified by a full tone color target and an undertone color target. Each ink formulation has a combined full tone L-C-H-a-b dE equal to or less than about 2, and a combined undertone dE less than or equal to about 3. The specification of ink colors may also include a light fastness value. The ink colors may be further specified by way of a proofing index value.