(_d._) _Antimony._--This metal imparts a blue color to the blowpipe
flame, but if the metal is in too small a quantity, then the color is
a brilliant white. If antimony is fused on charcoal, the fused metal
gives a blue color. The white sublimate which surrounds the fused
metal, being subjected to the flame of oxidation, disappears from the
charcoal with a bluish-green color.

(_e._) _Selenium._--If fused in the flame of oxidation, it imparts to
the flame a deep blue color. The incrustation upon charcoal gives to
the flame the same rich color.

(_f._) _Arsenic._--The arseniates and metallic arsenic itself impart
to the blowpipe flame a fine blue color, provided that there is no
other body present which may have a tendency to color the flame with
its characteristic hue. The sublimate of arsenious acid which
surrounds the assay, will give the same blue flame, when dissipated by
the oxidation flame. The platinum forceps will answer for the
exhibition of the color of arsenic, even though the salts be
arseniates, whose bases possess the property of imparting their
peculiar color to the flame, such as the arseniate of lime.


C. THE GREEN COLOR.

(_a._) _Ammonia._--The salts of ammonia, when heated before the
blowpipe, and just upon the point of disappearing, impart to the flame
a feeble though dark green color. This color, however, can only be
discerned in a dark room.

(_b._) _Boracic Acid._--If any one of the borates is mixed with two