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The unabridged Random House Dictonary defines ceramic thusly: ceramic adj.-1. of or pertaining to products made from clay and simlar materials, as pottery, brick, etc., or to their manufacture 2. ceramic material Now a few disclaimers: I am by no means an expert, and this edition of the dictionary is copywrited 1973. You will notice that the definition includes brick as a ceramic material. Presuming they mean ordinary brick, dried mud is a ceramic material. Mud is essentially wet dirt, and dirt (or soil if you prefer) contains at least trace elements of metals. So I don't think that ceramic means 100% metal-free. The solid nonmetals which are safe to use (I think) are: Boron, Carbon, Silicon, Phosphorus, Sulfur, Germanium, Selenium, Antimony, and Tellurium. For those of you who are chemically inclined (I by no means am), most of these can form ionic compounds with metals (probably transition metals in my layman's opinion), and some would probably form compounds such as carbonates. I hope I have not confused you any more than I have confused myself, and I'm probably wrong about this anyway. See you around the forums, Daniel
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