At 08:24 AM 18/08/04, you wrote:
Occasionally my bullion coin electrodes get a
hard coating if the DW is not good

Matthew, that must be some crook water!!!
I use .9999 $5 Canada Maples and get a black "soot" coating that I take off with a tissue. I'm no expert here, but somebody else had a similar problem with a black "varnish" here.
Think it turned out to be the water.

Himagain

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