How I Can Find Out If My Earthenware Dishes Have Lead?

Test earthenware dishes for lead.

Ceramic or earthenware dishes can be tested for lead using home testing kits available at most home improvement stores. Lead testing kits are generally less than $10, and you only need to test one plate or glass from a set to discover whether lead is present. Be aware that testing kits are not 100 percent accurate. The only way to be completely sure your dishes are lead-free is to have them analyzed at a lab.

Significance

Most earthenware dishes are coated with a glaze before firing to protect the surface and make the dishes durable enough for everyday use. Many glazes, especially glazes that were used prior to the 1970s, contained lead. This lead can seep, or leach, into food and over time can cause lead poisoning.

Identification

Home testing kits should be used if there's any suspicion of lead in your earthenware dishes. Some dishes are more likely to contain lead-based glaze than others. According to the Center for Environmental Health, some higher-risk dishes include rustic terra cotta pottery, rough or raised highly decorated dishes and any dish that has a chalky residue when washed.

Effects

Earthenware dishes are not a major contributor to lead poisoning, but if dishes containing lead are used often enough there could be a toxic buildup over time. This is especially true for young children who may acquire intellectual development problems caused by lead exposure.

Considerations

Dishes that are coated with lead glaze will leach more lead into food if heated or microwaved. Be especially careful with coffee mugs or inexpensive imported cups that could leach significant levels of lead.

History

Beginning in 1971, the FDA established earthenware lead limits in the United States. Lead limits have also been established in countries such as Australia, and manufacturers in these countries must label their dishes "lead free" or "not safe for food use" depending on lead levels in the glaze.

References

• Center for Environmental Health: Lead in Dishware
• Australian Department of the Environment, Water, Heritage and the Arts: Lead in Ceramics