Abstract
IT is sometimes stated that the blue flame which is seen when common salt is thrown on to a coal fire is due to traces of copper in the coal. It is much more likely that this flame is that of carbon monoxide produced by the cooling of the hot coal by the salt, and certain observations lend support to this view, such as the following:
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HUGHES, W. The Blue Flame produced by Common Salt on a Coal Fire. Nature 109, 683 (1922). https://doi.org/10.1038/109683a0
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DOI: https://doi.org/10.1038/109683a0
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