A water-based modeling clay that contains sulfur, is economical, and specifically designed for use with our natural latex. Because it contains sulfur, it should not be used with urethanes or silicones without a protecting release or separator. This clay is not developed for use in constructing originals. a water-based modeling clay that contains sulfur, is economical, and specifically designed for use with our natural latex. Because it contains sulfur, it should not be used with urethanes or silicones without a protecting release or separator. This clay is not developed for use in constructing originals.