Hi Technos, I can really use your expertise to clarify one of my recent worries. I have a batch of boards on which, after the first reflow, the slikscreen marking turned pink, from the immaculate white it was displaying before. Not that I don't appreciate a little of "pynk" inside the gray "walls", but I wonder why did this happen. Out of a batch of 20, 5 changed color. The boards are high complexity, ultra high density, extremely high-end, big $$ value, etc. Since this is not the first time we build these assemblies, I can't blame it on the reflow profile or a reaction with the flux of our no-clean paste. I suspect a sort of insufficient curing. Am I right? If so, and now's the worry, could this hide some other, more detrimental, flaws of the PCB? Many regards, Ioan --------------------------------------------------------------------------------- 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 the following message: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------