How to Use the Real Color Wheel (These are transparent primaries to paint with. Transparent yellow, transparent magenta and transparent cyan. These colors mixed will make red, blue and green, adding white will make them tints and opaque).
you can use this wheel to better predict a required adjustment in the Variations dialog box. For example, the color orange is located midway between red and yellow. Therefore, if you recognize that an image has an orange cast, you can remove it by clicking red's opposite, More Cyan, and then clicking yellow's opposite, More Blue.