Improvements in fruit color increase the market value of fruit, and AVG generally delays ripening and undesirable color formation on fruit (Greene and Schupp, 2004: Rath and Prentice, 2004). A distinctive effect of AVG treatments on ripening and color set of plum was not observed in this study. Only retarding impacts of AVG treatments on chroma values were observed. Steffens et al. (2011) reported that color formation of ‘Laetitia’ plums was linearly retarded with increasing doses of AVG. However, Greene (2005) indicated that AVG retards ripening and consequently prolongs the life of fruit on the tree. In this case, fruit are exposed to sunlight for a longer time and color formation is indirectly influenced by day and night temperature differences. Lozano et al. (2009) determined the L*, chroma and hue angle values for ‘Black Amber’ fruit as 22.08, 3.05 and 7.77, respectively, and Khan and Singh (2010) observed that color values in ‘Black Amber’ plums did not change during the ripening period. The findings of the current study are mostly similar to those of the above researchers.