Virtually anyone who uses a microetch on a PCB that is selectively plated
with gold has experienced the problem.  I understand the mechanism, and have
no brilliant suggestions to avoid the problem.   Anytime you get Gold in
electrical contact with Copper and they are both wetted by an etching
solution the speed of the etchant accelerates dramatically.

If you can cover the Gold so that the microetch does not contact it, you have
got it solved, but this is easier said than done, especially if you do not
want to cover any Copper too.

Rudy Sedlak
RD Chemical Company
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