I have never seen it happen with Taiyo mask but have with another Legend ink especially if processed through ENIG. From our investigation it appears tobe reacting with the sulfuric acid in the ENIG line - off line testing with dilute sulfuric acid produces the nice purple color. Regards Gerard O'Brien Photocircuits Corporation -----Original Message----- From: Tom Burek [mailto:[log in to unmask]] Sent: Thursday, May 27, 2004 6:02 PM To: [log in to unmask] Subject: [TN] Purple Solder Mask Greetings Technetters, I have a circuit board that specifies Taiyo PSR-4000 white. Some of the boards have a distinct purple tint to them. Has anyone seen this phenomenon before? Do you have any ideas what could cause it? Thank you in advance. Tom Burek, CID+ --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------