Graphics`ArgColors`
ArgColor, ArgShade, and ColorCircle are obsolete, with simple definitions in terms of system functions.
ArgColor can be defined in terms of Hue, Rescale, and Arg:
Version 5.2
ArgShade can be defined in terms of GrayLevel, Rescale, and Arg:
Version 5.2
ColorCircle can be defined in terms of Hue:
Version 5.2