In addition to this phenomenal little tube of shine, Max Factor is credited for formulating the first camera worthy makeup in 1912, the original pan cake makeup in the 1930's and the first under eye concealer stick in 1954.
You can purchase a product specifically for this purpose, like Urban Decay Primer Potion or Too Faced Shadow Insurance, or you can use your concealer.
Applying your foundation, concealer, and any highlights and contours you'd like to add will set the stage for your colorful products, like blush, shadows, and lip color.
Apply your concealer with your fingertips or a small, flat brush after your foundation so that you won't just wipe your cover-up away when you apply your foundation, once again revealing dark circles or spots on your skin.
If you're using your fingers, lightly pat the concealer into place with your ring finger.