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Food safe ceramic uses glazes that are made from harmless materials like silica, dolomite, kaolin, feldspar, ball clay, and others. In these glazes, the inevitable leaching that occurs is only a functional and aesthetic issue and has no health impact. Glazes that contain metals such as lithium, lead, or barium may present a health issue. Ceramic containers made with such glazes cannot be sold in the United States without either a permanent marking stating it is "Not for Food Use - May Poison Food" or have a hole in the container (presumably rendering it useless for food preparation). If you make your own ceramics, make sure you use a food grade glaze if you plan to use it in your kitchen.

זה מ - http://www.cookingforengineers.com/a...afe+Containers