How old is the ceramic tile and what color is it? In the past ceramic frit paint formulas used to make "bright" yellows, oranges, and red colors contained lead, cadmium, and sometimes barium to produce vibrant colors. I would pass on using ceramic tile if it had any vibrant colors present.

Ceramic Toxicology

Last edited by Shorty; 02/09/14 12:34 PM. Reason: added link