Matthew -

I would advise getting a cross section of the silver hole as soon as
possible. The copper in the hole is the current carrying feature, not the final
finish.  I would guess that there is not much copper in these holes, if you can see
the laminate glass bundles visually.  In fact, there is a two sided board
construction, mostly practiced in Asia, that uses no copper.  The silver
containing paste is pulled through the hole with vacuum, and just coats the hole walls.
 This "silver through hole" construction is found mostly in consumer
electronics, that have relatively short use lives.

Denny Fritz
MacDermid

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