ANOVA results showed that text color did significantly affect visual performance (mean percentage and mean answer). Blue text resulted in best visual performance, followed by green, red, and gray. Overall, the color text seemed to promote better visual performance than the gray text. This result is consistent with the findings of Lin and Huang [18] that the primary colors had better perception time and can improve visual performance. Lippert [24] proposed that the ΔE scale could provide good prediction of legibility performance. Since the ΔE scales are smaller for the gray than for the primary colors under the same luminance, their lower small ΔE also resulted in worse visual performance. In summary, chromatic text with primary colors had better visual performance than monochromatic text.