Chlorine is in
each case liberated, and a fluoride of the metal formed. A few require
heating, when a similar decomposition occurs, often accompanied by
incandescence, as in case of chromium sesquichloride.
_Bromides_ and _iodides_ are decomposed with even greater energy, and
the liberated bromine and iodine burn in the fluorine with formation
of their respective fluorides.
_Cyanides_ react in a most beautiful manner with fluorine, the
displaced cyanogen burning with a purple flame. Potassium ferrocyanide
in particular affords a very pretty experiment, and reacts in the
cold. Ordinary potassium cyanide requires slightly warming in order to
start the combustion.
Fused _potash_ yields potassium fluoride and ozone. Aqueous potash
does not form potassium hypofluorite when fluorine is bubbled into it,
but only potassium fluoride. _Lime_ becomes most brilliantly
incandescent, owing partly to the excess being raised to a very high
temperature by the heat developed during the decomposition, and partly
to the phosphorescence of the calcium fluoride formed.
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