If your legend is epoxy based it is likely yellowing during the heat incursion, and making the white ink look off-white. Check temperature and time in the solder. The size and thickness of the board and its ability to absorb heat may also be a factor. Regards Greg Triggs ----- Original Message ----- From: "Eric Laroche" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, October 02, 2003 7:43 AM Subject: [TN] Silk screen changing color > Good morning Techers, > > Does any one have an idea why when I pass a particular board in the > reflow oven the silkscreen changes to an off white colour? Originally > the colour is bright white and becomes almost yellow after heat is > applied to it. > > > Thanks to all, > > Eric > > --------------------------------------------------- > 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 -----------------------------------------------------