There is a safe amount of unmolten wax at the base of all our candles, as well as a thick glass base. This base ensures stability and safety when burning the candle, by preventing the glass from being damaged by the heat of the flame, as well as the surface on which the candle is burning by keeping the heat at a safe distance.
The coloured glass and lid are also designed to be reused for tealights or storage. You can remove the leftover wax with warm water, and then reuse the glass however you'd like.