Tile Club feature:
"Do Zellige Tiles Have Lead in Them?
Traditionally, zellige tiles contain lead due to the glaze used in the firing process. These glazes result in the gorgeous, deeply saturated colors zellige tiles are known for, but that color comes with a downside. "Authentic, hand-fired zellige tiles are typically made with glazes that contain significant lead levels, sometimes exceeding 30,000 parts per million (ppm)," says Ariana Anderson, e-commerce manager at Tile Club.
However, not all zellige tiles contain lead. There are some modern versions that feature lead-free glazes. Still, you can't assume all modern zellige tiles are lead-free. As Saine explains, you need to request documentation. "Modern, more tightly controlled production is more likely to offer documented lead-free glazes," she says."
...Read full article on MarthaStewart.com