3.5 Color Supplemental R G B 2541 180 C M Y K --- --- --- --- # FE7600 P --- Orange R G B 138 43 226 C M Y K --- --- --- --- # 8A2BE2 P --- Violet R G B 160 82 45 C M Y K --- --- --- --- # A0522D P --- Brown The supplemental colors are to be used when absolutely necessary. They work well when an action has a standard color associated with it . For example: orange works well as a cautionary color for UI elements, like when a user is filling our a form with sensitive information.