Research on the function of color in instruction and learning is reviewed, and the rationale for its use in instructional materials and as an aid to learning is examined. Three points are made: (1) on the basis of research results, it is not yet possible to prescribe the use of color cues in instruction; (2) color is presently being used in instructional materials only as a means of carrying basic information, not as an additional cue to enhance learning; and, (3) the cue value of color depends on the availability of a variety of other more potent cues. It is implied that the nature and extent of interaction among differing ages, abilities, skill development, color cues, and other available cues should be further clarified. (Author/NS)