What is the purpose of your mixing with these antique boards?
My advice is that you perform a EDS or perhaps FTI R analysis of the
fragments. Faster way than us guessing.
We know nothing about your products:
-manufacturer
-copper thickness
-number of layers
-finish
-size
-how were they stored?
-what environment?
etc.

Interesting forensic but little foggy

Inge




On 8 March 2012 19:39, Goodyear, Patrick <[log in to unmask]> wrote:

> Ok got a new one.    Found on the plated portion of a turret a black fuzz,
> also on the riveted backside and the plated portions of all of the lands
> outside the soldered areas.
> It cleans right off with alcohol leaves no residue, is crystalline in
> structure and grows away from the metal has a coral like appearance.
>
> I have attached pictures but Steve is off today so don't know who else can
> post.
>
> Again a 40 year old board.
>
> Any ideas????
>
> Pat
>
> .
>
>
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