Or somebody sneezed. You might try to recreate the spots by flicking some water on the panel. It could also be algae growing in the tanks. When I hear black spots on copper I think tarnish. Hans -----Original Message----- From: JaMi Smith [mailto:[log in to unmask]] Sent: Thursday, March 21, 2002 2:57 PM To: [log in to unmask] Subject: Re: [TN] Tiny black spots on copper foil surface Shirley, Sounds like it might be very very small pin holes in your resist that is letting in a microscopic amount of etchant. JaMi Smith -----Original Message----- From: Shirley Xiao [mailto:[log in to unmask]] Sent: Wednesday, March 20, 2002 11:14 PM To: [log in to unmask] Subject: [TN] Tiny black spots on copper foil surface Dear All: We encountered a problem after develop, etch & strip. Lots of tiny black spots were found on copper surface. We are sure that these tiny black spots are not oxidization.They can not be removed by acetone but is removable by micro etch.Before get result by EDX element analysis, I wish anyone have similar experience can share some information with me. __________________________________________________ Do You Yahoo!? Yahoo! Movies - coverage of the 74th Academy Awards(r) http://movies.yahoo.com/ ------------------------------------------------------------------------ --------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ------------------------------------------------------------------------ --------- ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------