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Date: | Thu, 8 Mar 2012 20:27:22 +0000 |
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Olav
I think you may have hit it on the head. It does have a tarnished silver look, and yes most of that stuff was silver plated way back when. I just had never seen it before and I have done a bunch of these style boards.
Pat
-----Original Message-----
From: Olav Folland [mailto:[log in to unmask]]
Sent: Thursday, March 08, 2012 11:06 AM
To: TechNet E-Mail Forum; Goodyear, Patrick
Subject: Re: [TN] Black substance
Aren't a lot of those turrets silver plated? Would silver whiskers tarnish like that over age?
I'm just a CAD guy, but that's the first thing that comes to mind...
Olav
On 3/8/2012 10:39 AM, Goodyear, Patrick 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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