It is most likely that the flame was extinguished before the stone had reached its working temperature. Put the Snuffer-cap on the Lamp and leave it for 20-30 minutes to prime. Light the stone again and allow the flame to burn for a full 2 - 3 minutes before extinguishing. Please note that after igniting the stone, the catalytic effect is optimised between 2 and 3 minutes. If this does not work it is likely your stone has become clogged. Follow the instructions below for "How do I clean the Stone?"