Terracotta Air-Dry Clay is a fine, natural clay that dries to a hard solid over two to three days. It is easy to use with traditional modeling techniques and a snap to clean up. Air-Dry Clay lets young artists create Terra Cotta sculptures without the hassle of a kiln or oven. It is smoother, finer and more moldable than traditional clay. Dry pieces can be painted or varnished. This Air-Dry Clay works well with other Crayola products, including tempera paints, acrylic paints and watercolors. Children can paint over entire slabs or add simple accents to create a colorful final piece of art.