Example: Green is directly across from red. Green will neutralize red.
By analyzing and understanding the color wheel, color correcting will be an easy technique.
Green- is used to neutralize red spots such as blemishes.
Purple- is used to eliminate yellow undertones or any dullness in the face.
Pink- counteracts grey or brown. It gives radiance to Olive tones & it can be used to brighten undereyes.
Yellow- is best to counteract purple or blue such as bruises, veins & undereye circles. I personally use yellow to brighten the undereye area.
There are sooooo many different color correctors on the market from $1.99 LA Girl correctors to higher end brands such as YSL and Make Up Forever Professionals. If you have any discoloration issues that you want to correct, try a color corrector!