A candle is usually a column of wax with a wick at the centre for burning. Some candle wicks have a very thin metal centre used to keep the wick upright while burning. If this core is made of lead, unsafe levels of lead can be released into the air while burning. These candles can be identified by a silvery or dark lead core in the fabric of the wick. Candles with wicks that contain lead in a quantity greater than 0.06% are banned.
Candles containing more than 0.06% of lead when burned in an enclosed area for a long time can release high levels of lead into the atmosphere and cause lead poisoning. Lead poisoning in unborn babies, small children and pregnant women can lead to: