Edges and corners concentrate current like a pointed lightning rod..that
would be edge and corner ionic discharge you are seeing.
Flat face center and back sides do little ionic discharge.
..all those little ridges on the edges will go first.
Modern electroplating electrodes are D shape profiled so the center
front will come into play.
Making the coin into a shallow bowl with the protruding side toward the
other electrode will help..even minor distance variations count.
ode
On 9/20/2014 8:02 PM, John Popelish wrote:
I bought a 1 troy oz 9999 silver Canadian, Maple leaf coin
to use as an anode . These run about half the price of
silver wire of the same purity, and with a lot more
confident provenance.
But it does not act like it is bare silver. It is extremely
clean and shiny for a bare silver surface, with no sign of
tarnish. It discolors and frosts along fine lines, not all
over the surface, when used as an anode.
Does anyone here know if these coins are coated, and if so,
what with?
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