No lead in unglazed tiles?
I know this has been discussed before, but I am having a hard time finding a definitive answer. If I buy unglazed quarry tile, of unknown origin and content, do I need to worry about lead or other harmful substances? I'm beginning to think that all the worries about lead are stemming from warnings about glazed tile, which have led some people to think that the tile itself is the problem, whereas the actual source of the lead is the glaze, not the tile. If so, then just about any unglazed tile should be lead-free. But before I run out and buy some I'd like to see if anybody has any information to corroborate or call into question my theory.