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Hi Folks, I have recently painted a simple design in Magnesium oxide over a white tin glaze which matures between 1100 and 1180 C. I read since then that Magnesium Oxide is one of the potters more toxic oxides . There is notoriously very little actual data about the safety of many glaze surfaces, but would anyone hazard an opinion as to the safety of this bowl for functional/ food use - given that the oxide is now securely bonded to a stable glaze? I would love to use/ give this bowl away, but am worried about the toxicity of the oxide which was only put on in a wash solution.