Could anyone out there help with the explaination of why after wave soldering that there will appear a gold film mainly on top of the PWB? Some of our inspectors are concerned and question what this substance is? Thanks for any help on this subject. Terry Huddleston Teledyne Lewisburg *************************************************************************** * 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. * ***************************************************************************