That is a blob of resist on the surface 

James Hofer
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Tuesday, June 02, 2015 4:10 PM
To: [log in to unmask]
Subject: Re: [TN] PCB blob defect

It's definitely done thing on top of the board. To be more certain,‎ we'd need the board for analysis.

Regards,

Vladimir

Sent from my BlackBerry 10 smartphone on the Rogers network.
  Original Message
From: Watson, Howard August
Sent: Tuesday, June 2, 2015 18:56
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: [TN] PCB blob defect

Hi all,

My PCB fab knowledge is limited, and a very unusual defect was discovered (too late) in assembly. I'm wondering if anyone has seen something like this before, or has an idea what this could be. The blue color seems noteworthy to me. This is for IPC class III, space. I will return this to the fabricator, but I wanted to get educated in case there is a debate regarding the cause. Thanks for your help!

Steve put the pictures here:

http://stevezeva.homestead.com/Howards_Blob.jpg

http://stevezeva.homestead.com/Howards_Blob_close.jpg
Howard A. Watson

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