>ammoniacal etchant, is to use ORP, as you would in Cupric Chloride etching.

I have found it difficult to use ammonia or cupric for this application due to
what happens when these chemistries hit the rinse. They etch fast and don't
seem to rinse fast enough to get unifomity of the copper being left on.

Might try sulfuric-peroxide; preferably in a batch tank, not spray. I've had
this work well. We considered the larger tooth an advantage once the circuits
were etched.

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