Myron, sounds like your laminate has not been cured properly at the inner layer bonding process of PCB manufacture. Are there any delaminations visible? Does the build of the PCB meet the spec for the part ie dielectric thicknesses. Is the section around the holes thin, sometimes you can get colour distortions if light is shining through the section. Can you check back with your PCB supplier to ascertain the Tg of material used. Just some questions you might like to ask yourself that might help you find a solution. Good luck Regards Kenny Travers Digital mosshill Ind Est Ayr, Ayrshire Scotland e-mail [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************