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This glaze is actually totally clear. Fired to a temperature over 2000 degrees F, it is food safe and very strong. What you are seeing is the white porcelain clay beneath it. I intentionally leave the outside with a rough exterior , so I can decorate with the iron oxide that makes the Sedona rocks red in color. I like the juxtaposition of the smooth inside with the rough exterior. Kind of like life I guess. Comments?