As a Professional Makeup Artist, it is crucial to know "Color Theory" and "Color Correction". This is where complementary colors are used to cancel the effects of each other.
1. Green helps to offset RED: Covers bright red blemishes
2. Purple helps to counteract YELLOW tones: Helps to counteract yellow tones such as those in Asian skin
3. Yellow counteracts PURPLE tones: Covers dark circles under the eyes
4. Coral helps to boost radiance of the skin: This is the easiest way to fake a glowing fresh face when you're feeling tired and
your skin has any unflattering blue-grey tones running throughout it