Hi Chris, If your gold deposit is high in base metal content ( > .5%), eg cobalt or nickel, then tarnishing will occur. Please confirm the alloy for excessive brighteners and/or impurities. Additionally, field tarnishing may occur if installed. Technic at 401-681-7100 for a cleaner. Good Luck, Lenny Kurup EMX Enterprises Ltd Markham, Ontario, Canada On Wed, 10 Jun 1998, Chris Rucinski wrote: > TechNetters, > > Is there chemistry available to remove oxidation > from gold tips without compromising > solderability? > > More specifically we have a costumer that has > sent back some boards that have been stored > for almost a year. The gold tips are tarnished. > The customer has requested that we rework the > boards, without out buffing the gold out. An > analysis of the thickness gives 40 microinches > of gold on 300 microinches of nickel. > > Many thanks, > > Chris Rucinski > Process Eng. > > ################################################################ > 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 technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 > ################################################################ > > ################################################################ 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 technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################