Various approaches are possible: For vectors, you can reduce the colour mix until the sum goes below the desired colour application. For images, you have to use relevant filter functions such as reducing saturation or coverage, increase brightness and/or use an already limited colour profile.

Example: The blue tone is manually reduced from 230 % colour application (100/60/20/50) to 130 % colour application (80/50/0/0).

In most graphics programme you can use the eyedropper tool to check the colour application retrospectivetly.