Edward:

There are some of us who do not believe that the DMAB reduction process takes
the Copper Oxide to Cuprous, but actually takes it all the way to metal.  If
this is done, it probably happens only on the surface of the chrystal, ie. the
wetted section.   An analysis of the deposit for Copper metal contained, and
Oxygen, would likely give you the proper ratio for Cuprous oxide, but this is
because it is Cupric inside, and metal on the surface.

If this were the case, it would explain easily your conductivity results.

Rudy Sedlak
RD Chemical Company

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