Crack the Color Code
Concealers operate on the principle of neutralizing the enemy.
For example, if your skin's flaw is red (like a pimple), you can camouflage it with a concealer in the counteracting color, green. "It's the same basic theory that artists use," says celebrity makeup artist Joanna Schlip.
You cancel out one color (your flaw) by using the color (a concealer) that's directly opposite on the color wheel. Typically, the colors representing skin flaws are on the left half of the wheel, and the solutions are on the right (yellow can be either).
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