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<p>[QUOTE=&quot;desertgem, post: 1974145, member: 15199&quot;]The possibility would be there if the chip was not yet fired for hardness, and if coatings ( glazes) were light. A well glazed ( clear silica coating works well) high fired clay, would be unlikely to be affected by the plasticizers. Most clays contain some alkaline minerals which would react to the acidic plasticizers if they came into contact. I assume the chips are fired ( hard) and have some kind of glaze, coloring on them. If so, time/handling would have to make small cracks in the surface coating to cause problems.</p><p><br /></p><p>For my curiosity, is there reticulation ( cracks) in the surface of your oldest chips ? And among chip collectors is it permissible to use a sealer on them?[/QUOTE]</p><p><br /></p>

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