in the oxidizing flame.

Dissolves into a reddish glass which becomes yellow on cooling.
With a large addition of the oxide, the glass is brownish while
hot, and orange when cold.

in the reducing flame.

On platinum wire the nickeliferous bead undergoes no change.
Treated with tin upon charcoal, it becomes at first opaque and
grey, and after long continued blowing the reduced nickel forms
a bead, and the glass remains colorless.

* * * * *

8. Oxide of Zinc, ZnO.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves easily into a clear colorless glass, which, when much
oxide is present, may be rendered opaque and flocculent by an
intermittent flame, and becomes so spontaneously with a still
larger addition. When a considerable quantity is dissolved, a
glass is obtained which is pale yellow, while hot, and colorless
when cold.

in the reducing flame.