How Do Relightable Candles Work?


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Mary Frederick answered
Technically speaking all candles are relightable candles until there is no wick left to burn. The candle, the body of wax surrounding the wick does not burn, it is the wick, which burns. The wick draws fuel from the liquefied wax into the flame created when you light the wick. There are different sizes of wicks each designed to draw different amounts of fuel into the wick's flame. Too much fuel drawn into the flame causes a flare as well as soot. Too little fuel will cause the flame to go out. A loosely twisted wick will burn quickly because absorbs fuel quickly and sometimes dangerous amounts, which lead to fires.
A tightyly twisted wick will absorb less fuel and burn more slowly.

A wick is made of twisted or braided fibers capable of absorbing fuel, which is the liquefied wax caused by the heat of the flame. This is what you see when you light a candle. The more fuel present the more difficult it is to blow out a candle. This knowledge has led some birthday candle manufacturers to produce a candle, which relights as you blow it out because it is soaked with fuel, the hot liquified wax. These candles be fun, if there are not many of them placed on a birthday cake. However, when there are large number of these candles on a cake disaster can happen.

The longer each candle burns the hotter the fuel becomes and when someone blows across the candles, the fuel splatters and the flame relights because it is soaked with hot liquified wax.

There have been cases of ruined cakes because the person attempting to blow out the candles could not do this quickly, and candle wax has dropped over the icing. In other instances the person has blown so hard the liquified fuel has landed on flammable articles causing a fire. In still other instances people have been burned by the liquified wax. I even read a story about the top of a cake melting before the candles could all be blown out.

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