Lead test results on unglazed quarry tile and travertine tile
I metioned this in a couple of threads and I know some people were interested in the results, so I'll put them here. I bought two tiles at a tile shop, an unglazed quarry tile and an "unfilled" travertine tile, and had them tested for lead. The results show 1.03 mg/kg lead for the quarry tile, and <0.662 mg/kg for the travertine.
Now I haven't yet determined the implications of those numbers as far as food safety is concerned, and the lab is not in the business of making those kinds of judgments or recommendations, so if anybody has any thoughts on those numbers, please weigh in.