HI Paul - you will need to provide your material and process situation to the TechNet so we can formulate appropriate responses. Info such as flux, general reflow profile, cleaning chemistry type, etc. would be helpful. Keep in mind that just because a solder joint isn't "bright and shiny" doesn't mean it is a reliability problem. Dave Hillman Rockwell Collins [log in to unmask] Paul Allan <[log in to unmask]> on 06/08/99 11:17:31 AM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to Paul Allan <[log in to unmask]> To: [log in to unmask] cc: Subject: [TN] Dull discolored solder joints. Please - need information. We are currently suffering with an unusual problem SMT and through hole solder joints are coming out dull and yellow. The problem may be flux related. Solder joints appear to be yellow to gray in color. The condition is random. Does any one know of a chemical or soap to restore shine to the joints. Paul Allan. Graphic Research 818-886-7340 X1101 PaulA @ Methode-GRI.com ################################################################ 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 ################################################################ ################################################################ 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 ################################################################