Yes, certainly could be photoresist.

Joel


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Wednesday, June 03, 2015 11:07 AM
To: [log in to unmask]
Subject: Re: [TN] PCB blob defect

photoresist?  just a guess.
           jk
> 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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