Is it coming from the etcher? Or is it coming from another process like Tin Lead Strip? Chase it down. Remember, galvanic (stray currents....or whatever you may call them...<gremlins>) leaves some trend or pattern that may be repeatable between PCB's. Are you seeing that? Groovy ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################