1. American Society for Testing and Materials. Standard test method for lead and cadmium extracted from glazed ceramic surface. Method C 738, JADAC 1973:56:483–484.
2. American Society for Testing and Materials. Standard test method for lead and cadmium extracted from the lip and rim area of glass tumblers externally decorated with ceramic glass enamels. Method C 927, JADAC 1988;15.02:296–298.
3. Anonymous. China dishware manufacturers to pay $2.3 million in Prop. 65 suit settlement. Prop. 65 News February 1993;7:1–2. Available [Online}, http://www.prop65news.com/pubs/p65news/issues/9302/930202.html.
4. California Environmental Protection Agency. Title 22 California Code of Regulations, Section 12705, Ch. 3. Safe drinking water and toxic enforcement act of 1986, Article 7, No significant risks. State of California: Office of Environmental Health Hazard Assessment, 1986.
5. Code of Federal Regulations. Toxic elements in foods and tableware and cookware. 21CFR 109.16, 1994.