Scott I have seen this dissolution when performing multiple thermal stress tests. In fact eventually knees will disappear completely if you expose them enough One thing that can effect this is type of plating A totally electroless deposit will go into solution much faster than the electrolytic deposits. I have done nothing that would compare one to the other, but I do know it happens Susan Mansilla Technical Director Robisan Lab ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################