(in order to be usable the clay must be fired from 1674 degrees F (cone 010 to cone 04 MAX.) Firing is available from New Mexico Clay in Albuquerque.
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.