We have recently experenced a brown resin like substance in our solder bath after wave solder of a qty of paper phenolic pcbs. The boards have a solder resist and laqer finish. Can anyone tell me what this bown substance is and what is the cause. Thank you Jim Hedderick [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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************