Just won this capacitor. It should be useful for creating the high positive potential of the chassis, at about the levels of the WB6.
This thing can definitely deliver a lethal shock. It comes with the terminals shorted so it doesn’t spontaneously charge.
Prometheus Fusion Perfection 
The phenomenon you refer to is called Capacitor Soakage.
Nice article on it at National Semiconductor.
Another term for it is Dielectric Absorption.
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