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Upgrading from:

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 << Graphics`ArgColors` ArgColor[1 + I]
Wolfram Language code: Hue[Rescale[Arg[1 + I], {0, 2π}]]

ArgShade can be defined in terms of GrayLevel, Rescale, and Arg:

Version 5.2 ArgShade[1 + I]
Wolfram Language code: GrayLevel[Rescale[Arg[1 + I], {0, 2π}]]

ColorCircle can be defined in terms of Hue:

Version 5.2 ColorCircle[6]
Wolfram Language code: Hue[6 / (2.π)]