Is that a banana
in your pocket??? We're back to the drawing board with the new work in e-ware. Had some issues with pinholing and then the worst of all evils -shivering. The potter's best friend the hammer did some major damage to about a months worth of work. I promise I'll have this new work ready for a show in 2050.
I think little test bowls are so much better than test tiles....sometimes I even sell them and am continually amazed at the uses people find for them.
I will never stop loving terra cotta, but sometimes it makes my head feel like it's going to explode!
If you want some calculation help tweaking your cone 1 glaze or slip, send me the recipes and I will run them through Glazchem for you. My guess on the shivering is the expansion is probably too low on the slip or the clear glaze.
All the best,