Black Charcoal This specially formulated sheet mask is enriched with Pink Pomelo Extract to help purify your skin. Charcoal face mask is the skin-saving solution to detox and revitalize your skin. For normal, oily, combination and dry skin. How to use: Unfold the mask. Pat mask onto clean, dry skin, gently pressing edges until it fully adheres to your face. Leave the mask on your face for 15 minutes. Remove the mask and gently massage to allow the excess of the product to penetrate your skin. No need to rinse.