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Roman candle (firework)

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What's inside a ROMAN CANDLE

Whitefish Bay, WI Friendly and prompt service. Middleton, WI The service and pizza were excellent. The delay powder is packed tightly in the tube, so that the flame cannot reach around the sides of the plug of delay composition. It therefore burns slowly; as it is consumed, the flame moves down through the tube.

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When the flame reaches the topmost pyrotechnic star, the star is ignited. Because the star fits loosely in the tube, the fire spreads around it and ignites the lift charge. The lift charge burns quickly, propelling the star out of the tube. In doing so it also ignites the layer of delay powder beneath it, and the process repeats.

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There are several variations on this:. The stars of Roman candles can be found in a variety of colors.

Colors are manipulated by adding compounds which, when ignited, release visible light and other radiation. For example, when potassium perchlorate KClO 4 is used as an oxidizer, chemical reactions involving the dissociated elements of the perchlorate— potassium and chlorine ions—create barium compounds which emit green light especially BaCl 2. The potassium compounds formed by this reaction emit mostly near-infrared light, and so they do not affect the color of the star in a significant way.


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Alternatively, SrCO 3 can be added to the candle to produce a red or pink star, but, because it does not oxidize , more oxidizers and fuels must be added to sustain combustion. From Wikipedia, the free encyclopedia.

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