The Touche Eclat is NOT a concealer, it is a "final touch" highlighter to be used on top of ALL of your makeup to add light to the face. This is instead of using shadow to contour (in the old days), instead it is a new way of contouring using light.
Touche eclat comes in 4 shades: #1 (or the original unnumbered) is a Pink light - mostly for extremely fair skin (natural blondes with light eyes and pink tone to their skin)
#2 - Radiant Ivory - for fair to medium skin tones with more golden undertones in their skin
#3 Radiant Peach - medium or very tanned skin
#4 Radiant Caramel - dark tanned or dark Latin, dark African American skin, etc.