Behavior with Borax on Platinum wire

in the oxidizing flame.

Dissolves into a red or dark yellow glass (similar to that
produced by iron). During cooling, the color diminishes in the
intensity and becomes finally yellow. If much oxide be dissolved,
an opaque bead may be obtained with an intermittent flame, and a
still larger quantity renders it opaque spontaneously.

in the reducing flame.

The color of the bead becomes paler, so that a bead, which is
yellow in the oxidizing flame, is rendered colorless. With a
large quantity of oxide the bead becomes white and crystalline
on cooling.

Behavior with Mic. Salt on Platinum wire

in the oxidizing flame.

As with borax. During the process of cooling the color entirely
disappears.

in the reducing flame.

Both, when hot and cold, the bead is colorless, by which
character oxide of cerium may be distinguished from oxide of
iron. The glass remains clear even when containing a large