Purifying and Mattifying Carbon Mask 8 in 1 for oily and combination skin effectively refreshes, tightens pores and prevents imperfections, leaving skin silky smooth and matt. How to apply: Step 1. Apply the mask in a thin layer to a cleansed face, avoiding the eye area. Leave to act for the time indicated on the packaging. Step 2. Then rinse the mask off thoroughly with lukewarm water.