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Oxidizing and reducing flames
From Wikipedia, the free encyclopedia
A flame is affected by the fuel introduced and the oxygen available. A flame with a balanced oxygen-fuel ratio is called a neutral flame. The color of a neutral flame is semi-transparent purple or blue.[1] This flame is optimal for many uses because it does not oxidize or deposit soot onto surfaces.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Bunsen_burner_flame_types.jpg/640px-Bunsen_burner_flame_types.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/OxygenRichBlowTorchFlame.jpg/640px-OxygenRichBlowTorchFlame.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/FuelRichBlowTorchFlame.jpg/220px-FuelRichBlowTorchFlame.jpg)
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Types_of_oxyacetylene_flames.png/640px-Types_of_oxyacetylene_flames.png)