Fulguration
Fulguration , noun
[Latin fulguratio: compare French fulguration.]
1.
The act of lightening. [Rare] — Donne
2.
(Assaying) The sudden brightening of a fused globule of gold or silver, when the last film of the oxide of lead or copper leaves its surface; -- also called blick.
A phenomenon called, by the old chemists, fulguration.