Hello Netters, I just got through digging in the TechNet archives, now I need some more info. I have a PCB, (thru hole) that has a white appearance on the solder side, and white spots on component side. My findings in the archive suggest that it may be uncured solder mask. I have tried the suggestion of using hot air/ soldering gun and heating the solder mask to see if white disappears, which it does. I do not have any metheleyne chloride, so the other test I can not perform, is there another? I have tried hand washing PCB in IPA to see if white appearance may be surface residues, has no effect. I would like to know if there is anyone who has a similar problem? My interpretation of the archives were that it was random white areas, mine appears over entire PCB. Process Parameters: 1. Wave solder with Kester OA 2331-ZX flux 2. Wave temp 205-215 until 490F wave 3. Conveyor speed 4.5ft/min 4. Wash cycle 8min at 145-160F DI water no chemical] 5. 3 rinse cycle at 1min each at 145F Thanks in advance Tom B ################################################################ 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 ################################################################