Our Rainbow Air-Dry Clay is a self hardening clay that has no need to be cured in an oven or a kiln. It is available in 8 colors which may be blended together to make intermediate colors. Suitable for slab, coil or even wheel-thrown projects. May be finished with paint, stain, or with gloss fixatives. It will completely harden in a few days and is not food safe or good for containing liquids. Our Rainbow Air-Dry Clay is AP (Non-Toxic)