Not an answer on your question.
( Actually, I wonder if not one could use silver all over. Many years back
a lot of manufacturers had silver fingers. Together with correctly designed
connector forks, the contact points were gas tight, and there was no
 problem with connection reliability. If the boards will be slided in/out
several times, you need of course thicker silver than the std ImAg.
Wouldn't that be worth a study now when gold is extremly expensive.?)

My two sixpence

Inge



On 10 February 2012 16:48, John Burke <[log in to unmask]>wrote:

> Having some issues with silver immersion on a board with gold pated
> fingers - anyone having success with this?
>
> Issue apparently is in masking off the gold during the silver process.
>
> John
>
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