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I've recently had problems with dark rings or patches on my clay body, just underneath the glaze application, in a cone 6 glaze fire. It looks as though my clay body actually burned. My witness cones look great - just as they should. I'm firing to 2232. It's happening with my mid fire white stoneware as well. I have a fairly new kiln, and this hasn't happened before. Could I be over firing even though my witness cones look good? My kiln is 2 years old and fired, on average, once a month. Do I need new elements already? Thanks for any advise!