Upon charcoal ebullition takes place and the oxide is reduced.
The metallic cadmium is volatilized and incrusts the charcoal
with its characteristic deep yellow oxide.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

When in very large proportion dissolves to a clear glass, having
a yellow tinge, while hot, which disappears on cooling, and when
perfectly saturated, becomes milk-white.

in the reducing flame.

On charcoal the oxide is slowly and imperfectly reduced. The
reduced metal forms the characteristic incrustation on the
charcoal, but the is thin and does not exhibit its color clearly
until quite cold. The addition of tin hastens the reaction.

* * * * *

10. Oxide of Lead, PbO.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves readily to a clear yellow glass, which loses its color
upon cooling, and when containing much oxide can be rendered