blue enamel-like appearance under an intermittent flame.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

Dissolves readily to a clear glass, which, when sufficiently
saturated, is yellow white hot, and becomes colorless on
cooling.

in the reducing flame.

The glass obtained in the oxidizing glame becomes yellow in the
hot state, but on cooling assumes a beautiful violet color. If
too saturated, this color is so deep as to appear opaque, but is
not enameline. If the titanic acid contains iron, the glass
becomes on cooling of a brownish-yellow or red color. The
addition of tin neutralizes the iron, and the glass then becomes
violet.

* * * * *

25. Tantalic Acid, TaO^{3}.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves readily to a clear colorless glass, which, when
sufficiently saturated, may be rendered opaque with an