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 > > . > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________