About color balance for those who may not know: our monitors use RGB (red, green, blue) to display color. If we want to change the color balance of an image, we can do so by adjusting the opposites of these three colors (cyan, magenta, yellow). For example, if you have too much red in an image, you can **add** cyan to change the color balance and reduce the red. For a green tint, you can add magenta to reduce the green. Look at the attached image to see that I gave a green tint to the gray layer. I can then use color balance to add magenta which will reduce the green and make it closer to neutral gray. If you have a skin texture that is a touch too yellow, you can give the simple_color node a hint of blue. By adding blue you reduce the yellow in the skin. Add warmth to a cool (bluish) skin by tinting it with a little red/yellow (try adding a very pale peach color).