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tiles/slabwork without warping

updated wed 1 dec 04


pemichongan@COMCAST.NET on tue 30 nov 04

I am making signs from rolled slabs for gifts. I have success with them, but they warp slightly in the glaze fire. They are not warped after bisque. Can you tell me why and what I can do to prevent it? I am using a low fire red clay with a significant amount of grog. Glazing is underglaze and clear glaze on top.