dull under an intermittent flame. With a still larger addition
of oxide it becomes opaline yellow on cooling.

in the reducing flame.

The plumbiferous glass spreads out on charcoal, becomes turbid,
bubbles up, until the whole of the oxide is reduced, when it
again becomes clear. It is, however, difficult to bring the lead
together into a bead.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

As with borax, but a larger addition of oxide, required to
produce a yellow color in the warm bead.

in the reducing flame.

On charcoal the plumbiferous glass becomes grey and dull. With
an over dose of oxide a part is volatilized and forms an
incrustation on the charcoal beyond the bead. The addition of
tin does not render the glass opaque, but somewhat more dull and
grey than in its absence.

* * * * *

11. Oxide of Tin, SnO^{2}.

Behavior with Borax on Platinum wire