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cobalt oxide, et al.

updated sun 30 jun 96 on sun 9 jun 96

It is my understanding cobalt oxide is toxic in its liquid state, but
non toxic when mixed with glaze and fired, am I correct? If I used
cobalt oxide on the lip of a cup, not mixed with any glaze - just
straight oxide, toxic or not? What about the other oxides?
Laura on the Connodoguinet