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What materials are toxic?
The two materials that are proven toxic at this time are lead and cadmium. Lead is used to make glazes flow better at low temperatures. Cadmium is used primarily to create bright orange and red colors. There are other materials which may be toxic, but there is not enough evidence that they are unsafe at this time, so they are not regulated. Many of these materials are safe in low doses (for example, nickel, barium, selenium and cobalt), but toxic in high doses. So reducing leaching as much as possible is always a good idea.