|Monthly Tech-Tip |
This was used until about 2000. Any numbers relate to the type of clay being used (often a test). In this case, the body is a test mix of Plainsman H431. The year is 1981.
Tony Hansen is the author of Digitalfire Insight, Digitalfire Reference Library and Insight-Live.com, he is a long-time potter, ceramic lab-technician and body and glaze developer.