in the oxidizing flame.

Dissolves readily to a clear glass which with a small amount of
the oxide is yellow, while warm, and becomes colorless on
cooling. With a larger addition, the glass is, in the hot state,
of a deep orange color, which changes to yellow and finally
becomes opaline in process of cooling.

in the reducing flame.

A glass becomes at first grey and turbid, then begins to
effervesce, which action continues during the reduction of the
oxide, and it finally becomes perfectly clear. If tin be added,
the glass becomes at first grey from the reduced bismuth, but,
when the metal is collected into a bead, the glass is again
clear and colorless.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

Dissolves in small quantity to a clear colorless glass. A larger
addition affords a glass which, while warm, is yellow, and
becomes colorless on cooling. When in sufficient proportion the
glass may be rendered opaque under an intermittent flame, and a
still larger addition of oxide renders the bead spontaneously
opaque on cooling.

in the reducing flame.