Always trim the wicks to 0.5cm before lighting.
Follow the 2 foot rule - don't place a burning candle near clothing, books, curtains or anything flammable. Place candle holders on a stable, heat-resistant surface that is sturdy and large enough to catch any melted wax. Keep lit candles away from drafts, fans and any air currents. Keep candles at least 10cm apart. Never leave a burning candle unattended. Extinguish all candles when you leave a room or before going to sleep or if the flame gets too close to the candle holder or container. A candle should not be burned for more than four hours at a time. For a margin of safety, discontinue a burning a candle when 1cm of wax remains.