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A pocket of explosive gas, such as methane, is entombed in the wax along the wick. When the pocket is breached, the flame ignites the gas, which promptly consumes all surrounding oxygen to snuff the flame. A series of such pockets along the length of the candle allow for reuse.
||[+] I think we're getting old: it took 9 frickin' tries to get this ?
||Are you sure you want a gas? It seems that could
diffuse out over time, disabling this important
safety feature. But I'm sure someone here could
recommend a suitable solid alternative. [+]