YSL Touche EclatTouche clat Illuminating Pen instantly helps to brighten your best facial features without shimmer or glitter, giving a natural, luminous finish. Our light diffusing technology adds light and radiance to the face. Apply to areas where there is natural shadow or depth to illuminate and improve dullness or reduce the signs of fatigue. It makes your face appear less fatigued, as if revived consider it your secret weapon to conquer the art of complexion.