Posted: 5/26/2007 5:30:26 PM EDT
| Bought some trick candles for the kids b-day cake. I am going to have to include some in my BOB. They are hard to put out. I dipped one in water pulled it out and it reignited. |
|
how trick candles work To understand trick birthday candles, it is helpful to first understand normal candles so click here to read how candles work. The key thing about a normal candle that is important to a trick candle is the moment after you blow out the candle. Normally there is a burning ember in the wick that causes a ribbon of paraffin smoke to rise from the wick. That ember is hot enough to vaporize paraffin but it is not hot enough to ignite the paraffin vapor. The key to a re-lighting candle, therefore, is to add something to the wick that the ember is hot enough to ignite. That way the ember can ignite this substance and the substance can then ignite the paraffin vapor. In the links below, the most common substance mentioned is magnesium. Magnesium is a metal, but it happens to burn (combine with oxygen to produce light and heat) rapidly at an ignition temperature as low as 800 degrees F (430 degrees C) (aluminum and iron both burn as well, but magnesium lights at a lower temperature). Inside the burning wick, the magnesium is shielded from oxygen and cooled by liquid paraffin, but once the flame goes out magnesium dust is ignited by the ember. If you watch the ember you will see tiny flecks of magnesium going off. One of them produces the heat necessary to re-light the paraffin vapor, and the candle flame comes back to life! |
|
the only thing I found was they are not all made to the same standards. If you buy some, test a few from the box by lettng them burn all the way down and continualy trying to extinguish tem. It might be that not all them have the wicks dipped full length in the magnesium? |