First, buff Creamy Colour Corrector into a fluffy eyeshadow brush and gently pat into dark areas that appear purple/blue/green.. then, using the same brush technique, gently pat in Soft Matte Complete Concealer in a shade lighter than your skintone over the undereyes, making sure to apply minimal product and only where needed. Finish with a light dusting of Crystal powder, to set, for all day wear.