1. Light your candle in a well-ventilated room, away from draughts or fans, which can cause sooting (black marks on the vessel), or rapid, uneven burning. Place on a heat resistant surface, the base of the candle will get hot.
2. Burn regular-sized candles for one and a half to two hours at a time or until the wax has pooled to the edges. Burning for less time can cause the candle to 'tunnel', which leaves a build-up of wax around the vessel's sides and can reduce the maximum burn time. Burning for longer periods (over four hours) can cause the wick to move, or slant.
3. Make sure you stop burning your candle when 10mm of wax remains at the bottom, keeping an eye on a burning candle when the wax is low.