Color Palette won't appear in customized menus

Under edit-appearance-color.  Color is not selectable in this menu in my assembly.  When I go to customize the standard menu the color palette icon is not even an option either.  What causes this?  I can right click on a part and change it's color so I found a way around it but what caused me to lose the icon in the standard customize menu and why is it not selectable under the edit-appearance-color option?????

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