|Monthly Tech-Tip |
The two terra cotta clay bars were fired side-by-side at cone 01. The back bar is of a raw clay dug from a creek bed in Alberta, Canada. Notice how it puffs up inside and eventually splits open the outer layer (which has sealed in the gases of decomposition). The front bar is that same clay, but mixed 50:50 mix with Redart. The Redart raises the melting temperature enough that gases are able to escape before a high density is reached.