Or had open containers of soaps nearby, or stacked rubber or paper, or..... But, after all, if that is all that grew on an old RMA CCA after 40 years, well, not so bad, really. They should be able to be cleaned up, touched up, wash, clean, coat, and ready to go for another 40 years of service. ________________________________________ From: TechNet [[log in to unmask]] On Behalf Of Woolley, Mark D. (Mark) [[log in to unmask]] Sent: Thursday, March 08, 2012 4:49 PM To: [log in to unmask] Subject: Re: [TN] Black substance My first thought was silver sulfide. Were the PWBs stored in a high sulfur gas area? Nearby a tire factory, oil well or refinery, ot coal fired power plant? mark mark Mark Woolley |PTRL Laboratory | Avaya | 1300 West 120th Ave | Westminster, CO 80234 USA | -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Thursday, March 08, 2012 3:33 PM To: [log in to unmask] Subject: Re: [TN] Black substance Hi Pat, Got your pictures and have them posted. Sorry for the delay, but I'm still running in low gear. Here they are, and all I can say is YIKES! http://stevezeva.homestead.com/whisker1.JPG http://stevezeva.homestead.com/whisker2.JPG http://stevezeva.homestead.com/whisker3.JPG http://stevezeva.homestead.com/whisker4.JPG http://stevezeva.homestead.com/whisker5.JPG These look like the classic silver/copper corrosion from being exposed to reduced sulfur gasses such as hydrogen sulfide. Here's a good paper that details it all: http://chavant.net/new_site/files/pdf/HP_ImAg_Corrosion_Paper_ISTFA_2006 1.pdf I would be very scared, very, very scared... Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Thursday, March 08, 2012 11:25 AM To: [log in to unmask] Subject: Re: [TN] Black substance Hi Pat, Reply to me with the pictures and I'll get them posted... Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick Sent: Thursday, March 08, 2012 1:39 PM To: [log in to unmask] Subject: [TN] Black substance 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] ______________________________________________________________________ ______________________________________________________________________ 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] ______________________________________________________________________ ______________________________________________________________________ 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] ______________________________________________________________________