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  1. Hey all, So I am experiencing with more regularity that the feet of my bowls and mugs are sticking to the shelves. Sometimes chipping off when I remove them. every pot that i fire leaves a distinct brown ring on the shelves after they have been fired. and in time those collective rings cause the shelves to brown and even get a polish on them. I fire cone 10+(11/12) in a gas kiln and use a stoneware body with just a hint of red clay cut into it for color and earthy speckling. is this brown ring being caused by the iron in the clay or what other process is going on to cause my (unglazed) feet to stick to my shelves? Can anyone shed any light on what is going on and offer a solution. I'm not opposed to kiln wash but would rather not have to. thanks, Randy