Once the candle has been put out, simply cover it with the bell to silence its perfume. Always put it out once the top layer of wax has liquefied: the perfume has now reached its optimal diffusion. There is no point in allowing it to keep burning.
L’Officine Universelle Buly stresses that one must always make sure a candle is completely put out before leaving the room where it is burning, and that it is imperative to keep candles out of the reach of children.