See my post to SteveG re the DEC issue with solder mask. Your pix look much
like theirs. Is yours a UV cured mask? If so, incompletely UV cured masks will
thermally cure during wave or reflow soldering. In the case of wave solder,
this 'cure' step can bind dross and solder bits to the surface, giving it a
greyish colour.
[The original DEC photos are in one of K. Mittal's Contamination books from a
conference in Washington, DC.]

Bill Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO   80526
Tel: 970.207.9586     Cell: 302.377.4272

---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------