Electric Mid&Hi Fired Ceramics
Cone 6 Glaze Testing & Reporting
Collaborate on building an online list of well documented glaze recipes, with application and firing methods. Strong photo documentation. Only glazes that are mature at cone 6 will be included.
Testing the glazes, and identifying their problems and fixing them. Also, if there are obvious issues just by looking at a glaze recipe (like high barium, insufficient clay to suspend or harden, too much feldspar (which causes crazing), too much clay (causing crawling, peeling), hard-to-get materials, non-specific materials, etc) then it needs to be fixed as part of the testing I would say.
Tony Hansen included links below to procedures for a few glaze tests that could be done. Another good one would be to appraise the rate at which it settles, how hard is the dry layer, the water content of the slurry, the viscosity, these could be measured with commonly available tools.
Links:
MC6 Caribbean Sea Green Crawled.......
Has anyone had trouble with MC6 Caribbean Sea Green? On my first test tile, it looked as if it vaporized. I did not have vent on the kiln at the time and I follow the firing schedule per the MC6 book (kiln sitter though).
My next batch, (with a vent) I put a test tile on the top shelf along with some small bowls. These turned out great. On the bottom shelf, a soup mug with the same glaze crawled. The soup bowl is porcelain and the others are Seattle Pottery Sea Mix 5.
Thoughts?
-Jane
martha peddicord
Yes, I frequently have trouble with this glaze, usually pinholes. But when it is great it is really great. sometimes it gets weird noxzema blue streaks in it, all from the same bucket of mix, with the same firing and cooling. I do think thinner is better.
Apr 15, 2014