As with borax, but less intensively colored. During cooling the
color becomes somewhat paler.

in the reducing flame.

As in the oxidizing flames.

* * * * *

7. Oxide of Nickel, NiO.

Behavior with Borax on Platinum wire

in the oxidizing flame.

Colors intensely. A small amount of oxide affords a glass which,
while warm, is violet, and becomes of a pale reddish-brown on
cooling. A larger addition produces a dark violet color in the
warm and reddish-brown in the cold bead.

in the reducing flame.

The oxide is reduced and the metallic particles give the bead a
turbid grey appearance. If the blast be continued the metallic
particles fall together without fusing, and the glass becomes
colorless. This reaction is readily obtained with tin upon
charcoal, and the reduced nickel fuses to a bead with the tin.

Behavior with Mic. Salt on Platinum wire