bead is cooled.

Microcosmic salt dissolves it in the flame of oxidation, to a clear
yellow bead, which loses its color when cold. In the reduction flame,
when the bead is highly saturated, a violet-brown color is produced.
In presence of the oxides of iron, the reactions are like those of
niobic acid. With carbonate of soda, the reactions are similar to
those of niobic acid. By heating with nitrate of cobalt, it yields a
light grey infusible mass.

(_g._) _Titanium_ (Ti).--This metal occurs occasionally in the slags
of iron works, in the metallic state, as small cubical crystals of a
red color. It is a very hard metal, and very infusible. Titanic acid
occurs in nature crystallized in _anatase_, _arkansite_, _brookite_,
and _rutile_. Titanium is harder than agate, entirely infusible, and
loses only a little of its lustre, which can be regained by fusion
with borax. It does not melt with carbonate of soda, borax, or
microcosmic salt, and is insoluble in every acid except the
hydrofluoric. By ignition with saltpetre it is converted into titanic
acid, which combines with the potassium, forming the titanate of
potassium.

_Titanic Acid_ (TiO^{2}) is white, insoluble, and, when heated, it
appears yellow while hot, but resumes upon cooling its white color.

Borax dissolves it in the oxidation flame to a clear yellow bead,
which when cool is colorless. When overcharged, or heated with the
intermitting flame, it is enamel-white after being cooled. In the
reduction flame, the bead appears yellow, if the acid exists in small
quantity, but if more be added, then it is of an orange, or dark
yellow, or even brown. The saturated bead, when heated intermittingly,
appears when cold of an enamelled blue. By addition of the acid, and
by heating the bead on charcoal in the reduction flame, it becomes
dark yellow while hot, but dark blue, or black and opaque when cold.
This bead appears, when heated intermittingly, of a light blue, and
when cold, enamelled.

Microcosmic salt fuses with it in the oxidation flame to a clear
colorless bead, which appears yellow only in the presence of a
quantity of titanic acid, though by cooling it loses its color. In the
reduction flame this bead exhibits a yellow color when hot, but is red
while cooling, and when cold of a beautiful bluish-violet. If the bead
is overcharged, the color becomes so dark that the bead appears
opaque, though not presenting an enamel appearance. By heating the
bead again