Preharvest development of external red color of ‘Irwin’ and ‘Keitt’ mango (Mangifera indica L.) was enhanced with an application of the antitranspirant poly-l-p-menthen-8-9 diyl (Vapor Gard) prior to commercial fruit maturity. Both the percentage of fruit surface area showing red color and intensity of the red color was increased. Red color development in storage at 21°C was not affected by Vapor Gard. This effect was specific for the anthocyanin pigment(s). Colorimetric measurements in both yellow and green areas indicated that Vapor Gard did not affect disappearance of chlorophyll and development of yellow color at time of or following harvest.