A 2 (trait anxiety) × 4 (color) factorial design was used to determine the effects of red, green, yellow, and blue on state anxiety as a function of high and low trait anxiety. The State-Trait Anxiety Inventory was used to assess both trait (A-Trait) and state (A-State) anxiety for the 10 students assigned to each of the eight treatment combinations. High A-Trait students were significantly more anxious while viewing blue, red, and green than were the low A-Trait students and blue produced significantly more state anxiety than did either yellow or green. These results are consistent with state-trait theory and indicate that the effects of color on state anxiety may be confounded with trait anxiety unless the levels of A-Trait are equivalent for each color condition. The role of cultural and individual differences in the relationship between color and emotion and implications for research are discussed.