When it's time to put your scented candle out, we recommend you use the lid (ceramic or metal) or a snuffer to avoid any molten wax splashes or smoke emission.
Recentre the wick before the wax hardens after every use so the candle burns consistently. The wax should not touch the container. Last but not least, cut the wick with scissors or a wick trimmer so it is 5cm off the wax surface. This avoids the candle smoking or the wick falling into the wax, rendering your candle useless.
When there is no more than 5cm of wax, the candle is finished. You must not light it as it may overheat and the container may break.
Have you considered re-using our candle jars? You could give them a new lease of life: candle holders, vases, pencil pots etc.