Suppose that the surface of a liquid insulator, such as oil, is electrified
by spraying charge on it, as described by others. Then it is mixed with a
glass rod. This should produce a macroscopically uniform charge distribution
withinh the volume of oil. An electrified cloud can probably also be viewed,
in the first approximation, as uniform. (Only within a small volume region?)
Ludwik Kowalski