CRAYOLA Modeling Clay is a non-hardening art material. It is designed to be re-molded and re-used, and cannot be hardened. Painting is not recommended. Its main ingredients are an oil-based product and wax. Colored pigments are mixed with the base ingredients to make different colors. An herbal fragrance is added to the clay to give it a pleasant scent. Clay is a natural product, mined from the earth. It is classified chemically as a hydrated aluminum silicate and can vary in color from reddish-brown to off white, depending on its iron oxide content. Crayola Modeling Clay is mixed with special non-drying oils so that it can be shaped again and again. We also add other ingredients, like pigments, to give our clay color, and fillers, to make the clay feel dry. It is made in our Bethlehem, Pennsylvania facility in a very large mixer. It is cut into individual sizes and then wrapped by the same type of machine used to cut and wrap butter! Like all Crayola products, it is then inspected by our Quality Assurance team before being shipped to our customers.