Still testing

The search for a new liner glaze continues. This was a test of three different glazes to test glaze fit / thermal expansion. 
Lower image is a stress test. The test are placed in boiling water then into ice water to see if the glaze and the clay are expanding at the same rate. this test did very little so the test were placed into a kiln and heated to 375 degree C. then submerged into ice water.