Here's an example of how R#233 works in-game with a super-dark color like 206:
Here's the color palette AoK:TC uses, with each color's index value. The values here are used by UserPatch's "Resource 233" to determine the color of "Live" area. The standard, 0, is transparent for Live area only.
Remember, Resource 230 must be -53754 to allow this and other weather effects to work!
Below is a growing list of examples for each color of 233 - Live Color Over-ride in-game. 232 - Fog Color Over-ride uses the same color values.
Some images are tagged to allow you to sift through them, so searching "Night" will give good numbers to use for different shades of natural darkness. The standard, 0, will be tagged with everything to always be available as a comparison with searches.