Dissolves to a clear glass, which, when saturated, is yellow in
the hot state.

in the reducing flame.

The glass is of a pure blue. If the tungstic acid contain iron,
the glass becomes blood-red on cooling, similar to titanic acid.
In this case, tin restores the blue color, or, if iron be in
considerable quantity, renders it green.

* * * * *

30. Molydbic Acid, MO^{3}.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves readily and in large quantity. When but little is
dissolved, the glass is yellow while hot and colorless when
cold. When in larger quantity yellow while warm and opaline when
cold, and a further addition of acid renders it yellow when
warm, the color, on cooling, changing first to a pale enamel
blue, and then to an enamel white.

in the reducing flame.

The glass, which has been treated in the oxidizing flame,
becomes, when the acid is not present in too large a quantity,