And the tint of blue of high energy particles from posts "Glow Some More Glow", "Two Color World" and "Animal And Plant Torture" all dated 29 Dec 2017.
The varied thickness of the fired glass plate introduces a charge density difference and directs the current flow in one specific way.
The closer the contacts on the glass the higher the voltage across the terminals. Current increases with more collection length when the contacts run across the glass as parallel wires.
Goodnight...
