This is a little driver looking on cloud in the sky... More seriously- I believe this is oxidised copper below soldermask.Seems to be harmless, probably visual effect.Usually oxidation on copper does not effect adhesion. Edward > -----Original Message----- > From: Stephen Gregory [SMTP:[log in to unmask]] > Sent: ב דצמבר 05 2005 16:49 > To: [log in to unmask] > Subject: Re: [TN] What is this solder mask defect? > > Good Morning Everyone! > > I got Wee Mei's picture up...go to: > > http://stevezeva.homestead.com/files/Soldermask_Defect.JPG > > I've seen this before, but I can't explain it either. > > Kind Regards, > > -Steve Gregory- > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Wee Mei > Sent: Sunday, December 04, 2005 6:58 PM > To: [log in to unmask] > Subject: [TN] What is this solder mask defect? > > Steve, > > Hello, > > The suspect is completely flat and smooth to touch. An interesting > observation is that though it appear at the same location for all the > 10pcs > of board, the size of the image tend to get smaller and smaller if the > boards are arranged starting with the largest image. It can't be soda > strawing as it is not on trace. It can't be pink ring as it is not > around > hole. What can it be? What is the likely cause? > > Will ask Steve to put it up. Kindly take a look. Your opinion is greatly > appreciated. > > Regards, > Wee Mei > > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------