Tadelakt is a Morroccan style of lime plaster that is polished with a smooth stone, leaving characteristic burnish marks. It is also rubbed with black soap which renders it very water resistant, so that it can be used for showers, backsplashes, and other areas where tile is traditionally used. It is a unique and beautiful plaster made from lime, limestone sand, and pigments, and applied in several very thin layers over the course of a day or more.