Some Understanding of Stoneware Glazes
After I have digested what I've learnt from the lecture yesterday. I did a Si:Al graph with the high magnesium glaze grid. Then I followed what Mike had said and plot the materials on the graph as well. I feel like getting an eye test, every new bit of glaze information is like an optometrist putting a stronger lens on me and I gradually am seeing better!
The material graph actually show why a particular area of the glaze grid is glossy. The area follows the plotted graph and it works. Well, almost. There is zinc oxide in the recipe and the zinc has no al or si input, therefore it's not in the grid. But the zinc is an important secondary flux and I know that it affects how the glaze look.
Click here to see some photos from the lecture.