Re: How do trick candles work ?

I assume you mean the candles that relight themselves.

If so its all to do with the temperature of the wick in the centre of the 
candle. When a normal candle burns it is actually candle wax gas that is 
burnt. The wax melts first and then is vaporised by the flame and burns 
generating heatto melt and vaporise the next lot of wax. 

When the flame is extinguished 
the cycle is boken and the candle goes out. You can see the wax vapour 
continue for a few seconds as the wick cools. In 'trick' candles the wick 
is of a type of material (I dont know what!) that remains hot enough to 
reignite the wax gas without the need of a flame or match, thus the candle 
relights.