It never ceases to amaze me on the variety of questions asked in this forum. I would agree with Dave's assessment. Most of the dross you saw was a reaction between the water and starches of the potato interacting with solder, not pulling out existing solder. Organically, if you pull the bulk of the potatos out, the only chemical residues I could think of would be water and starch, neither of which should remain around for long. Not a practice I think I would implement. Doug Pauls CSL *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************