EM-210 is a soft, smooth, dark gray, general purpose modeling clay that can be fired. It is used as a Tooling Clay for mold making.
Water Clay is non-sticky, inexpensive clay, comprised of water, mineral fillers and special additives that provide excellent tooling abilities for sculptors and modelers. Use water to smooth-out surface and keep clay covered—plastic wrap/damp towel—when not in use. Unlike KC clays, it will harden and dry out if not properly stored in a semi-airtight enclosure.