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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