This command sets the color of the selected contour polylines and text based on the elevation interval values, which are essentially the number that the elevation ends with, so specific colors are assigned for elevations ending in 0, 1, 2, etc. The color assignements are defined in the Define Interval Colors dialog box.
Define Interval Colors Dialog
If Select Entities is set as Interval Colors Method, pick OK, and
you are promted to:
Select polylines and text to color: pick the entities
If By Layer is set as Interval Colors Method, set the layers by
Screen selection or from a list by Name, then pick OK.
Pull-Down Menu Location: Surface > Modify Contours >
Color Contours
Keyboard Command: ctrcolor2
Prerequisite: Contours polylines
File Name: \lsp\contour4.arx