To change the color of an arc type:
An Arc Colors dialog appears.
All arcs of the given type are immediately changed to the new color.
The color model used is RGB; a higher value for a color component adds more of that color. If necessary, pick other arc types and change their colors.
Note: The windows display the new color scheme only as they are redrawn; you may need to explicitly refresh the windows to see the new colors (§).
This step is optional.
Note: You cannot change the color of particular arcs; colors are tied to arc types.