_Aluminum_, on heating to low redness, gives a very beautiful
luminosity, as do also _chromium_ and _manganese_. The combustion of
slightly warmed zinc in fluorine is particularly pretty as an
experiment, the flame being of a most dazzling whiteness. _Antimony_
takes fire at the ordinary temperature, and forms a solid white
fluoride. _Lead_ and _mercury_ are attacked in the cold, as previously
described, the latter with great rapidity. _Copper_ reacts at low
redness, but in a strangely feeble manner, and the white fumes formed
appear to combine with a further quantity of fluorine to form a
perfluoride. The main product is a volatile white fluoride. _Silver_
is only slowly attacked in the cold. When heated, however, to 100 deg.,
the metal commences to be covered with a yellow coat of anhydrous
fluoride, and on heating to low redness combination occurs, with
incandescence, and the resulting fluoride becomes fused, and afterward
presents a satin-like aspect. _Gold_ becomes converted into a yellow
deliquescent volatile fluoride when heated to low redness, and at a
slightly higher temperature the fluoride is dissociated into metallic
gold and fluorine gas.
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