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Glazes and Decorations on Dishes glazes dinnerware care cleaning dishes decorations
Glazes and Decorations on Dishes Information from the Food and Drug Administration(FDA): FDA has compiled the following information on toxicity of dinnerware for Public Health Service's (PHS)FDA Drug Bulletin (Sept.-Oct. 1977). Glazes (compound glass coatings) are used to sealthe surface of dinnerware to make it shiny and smooth, easier to clean, more resistant to wear, and less likelyto absorb organic matter and entrap microorganisms onthe surface. Decals containing heavy metals are oftenbonded over the glaze, by firing, as decorations. Some of these are more resistant than others and their rate of release of toxic metals in the presence of acidic foods varies greatly. When glazes and decals are properly formulated, applied, and fired, however, no hazard exists under normal use conditions in the absence of acidic foods. According to FDA, the most prevalent problem arisesfrom heavy metals in the decals and glazes, not only on inexpensive pottery and intermediate-priced earthenware,but also on expensive fine bone china. Under normal conditions of use no health hazard is present, butleaching of heavy metals (cadmium, lead) may occur when acidic foods (carbonated beverages; cider; foodscontaining vinegar; fruit juice, cooked fruits and otherfruit products; sauerkraut; tomatoes; wines, etc.) are stored in dinnerware. Frequency of use, duration of storage, temperature, and location of decals influence the degree of toxicity produced. Decorative border decals on flat dinnerware obviously pose much less of a problemthan decals on the inside bottom of a bowl in direct contact with foods. In 1970, FDA initiated a testing program for imported dinnerware. In the early stages of the program well known brands including even fine bone china werefound to be in violation of FDA guidelines. In 1971, FDA began an inspection program to ensure the safety of domestic dinnerware as well. Fortunately, through government and industry cooperation the problem has greatly diminished. FDA does, however, maintain surveillance. If you purchase handmade pottery, ask whatis in the decals and glazes; be cautious about using foracid foods listed above.This article was written by Anne Field, Extension Specialist, Emeritus, with reference from the Food and Drug Administration newsletter. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. This file was generated from data base 02 on 06/24/03. Data base 02 was last revised on 12/04/98. Michigan State University ExtensionHome Maintenance and Repair - 01500127 12/04/98
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