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Re: [Phys-L] "Electric current" does not mean "electron flow"

If the goal is to exhibit positive current, please forget what I
said about electrolysis. A better example is copper electroplating

The current consists of Cu++ ions. The experiment is harder to set
up than the electrolysis experiment ... but the interpretation is
much simpler.

A reference is

... but don't bother with pre-1983 pennies. Copper wire is nearly
pure copper, and works fine. Use a coil of wire to achieve a large
surface area.