Investigation of Released Cadmium and Lead from Different Colors of Over Glaze Designs to Food Stuff in Different Conditions

Abstract

In this paper, leaching of lead and cadmium was investigated from porcelain over glaze designs
between different colors. Also the effect of microwave heating was considered on leaching of lead and
cadmium. Dishes were selected with a decor with the dominant color of gray, red, yellow, blue, and dark blue.
Amounts of cadmium and lead which leached from the container by acetic acid and orange juice were measured
according to the standard ASTM C738. The results showed that especially in the red and dark blue colors
cadmium and lead could be released easily by either acetic acid or orange juice, and these amounts were much
higher than the permissible standard amount. Also microwave heating could enhance releasing of lead and
cadmium from decorated dinnerware.