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Toxic Material listToxic Elements Silica: Sources- Quartz flint, frits, feldspars clays and glazes Vanadium: Sources- vanadium pentoxide and ceramic colours. Cadmium and selenium: Sources- ceramic colours and glazes Lead: Sources-Lead oxide, frits and glazes Chromium: Sources- Chrome oxide and some ceramic colours( greens) Copper: Sources- copper oxide, carbonate and some ceramic colours Zinc: Sources- zinc oxide, some ceramic colours Borax: Sources- borax frits
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